I have qualified NET but have 59% (less than 60%), what are career option then?

In this situation, I would suggest taking the NET exam again. Since you are unable to get admission in good government colleges for PhD only because you scored 1 per cent less than the required percentage, you might be able to score minimum marks in your next attempt.

Often it happens that when seats don't get filled in a university, those who could not get admission by a small bar, get a chance to get admission. For this candidates need to be vigilant to grasp the rare opportunity.

Since you are a B.Sc graduate, you enjoy the benefit of working or getting a job in science and non-science fields.

You can get a job in educational institutes, space research institutes, forensic crime research, chemical industry, forest services, hospitals, oil industry, agricultural industry, etc.

To be honest, there are multiple job prospects. But no one gets a job directly. It is necessary to clear tests and interviews. It is relatively easier to get a job in a private institution than a government institution.

Also, it would be relatively easier to help you if you tell us whether you did a simple B.Sc course or professional B.Sc course. If you have a degree in professional B.Sc course, what was your main field of study and other information is necessary to help you in detail.

As far as I know, there is no rule that one has to get 60% in NET. Once you are qualified that's it. There will be two lists. One is for Teaching staff qualification. The second list is for JRF qualification.

Minimum 40% is the mark in Paper 1 in NET exam.
Minimum 40% is the mark in Paper 2 in NET exam.
Minimum 50% is the mark in Paper 3 in NET exam.

Then they will make a merit list and who got 80 percentile will be declared qualified. You say you are qualified in NET. There is no necessity of seeing the percentage in NET.

You say you got 73% in B.Sc. Is this 59% in your M.Sc. Are you talking about your M.Sc percentage? It is true you can go for NET even though you got 55% in M.Sc. But when you go for a lecturer post many institutes look for the minimum first class in both graduation and Post-graduation. But I feel you got only 59% in your masters.

You are qualified in your NET for lecturer post or for only JRF. If you are qualified for PhD, then you have to catch hold of a guide who will accept for enrolling you as his student even though you got 59% in M.Sc. You will get the fellowship irrespective of your percentage.

The NET qualification is valid for three years. So you can improve your M.Sc percentage within these two years you will get a chance as lecturer or JRF.

Otherwise, you have to apply for NET again after two years with the improved M.Sc marks.

The immediate action you have to take is to apply for betterment in your PG.

Most of the university and institutes conduct Research Eligibility Test (RET) exam for admission in Ph.D. You can fill the form and qualify this exam also. And as you have scored 59% in Masters Degree, for improvement in marks, to achieve more than 60%, you can take improvement exam. I don't think so that most of the institutes need 60% marks. You should check jobs advertisements carefully. Sometimes there require academic qualification with minimum 55% marks.

You can also qualify for GATE Exam. Most of the PSUs like ONGC, BEL, BHEL etc. and government organizations also ask for GATE qualified candidates.

You got good marks in B.Sc. You have the vast career opportunities. You can choose any field listed below:
1. Banking: you can prepare for banking jobs like bank clerical, bank Probationary officer etc.
2. Railway jobs: you can prepare for Railway recruitment exams. There are lots of vacancies every year in the railways for technical and non technical candidates. You can start preparation for railways exams.
3. Research: You can also go in research filed. For this there you should check government institutes websites regularly they have lots of projects in which they recruit project staffs. Vacancies for posts of Scientist are also advertised from time to time.
4. Medical or pharmacy: If you have completed B.Sc. in life sciences, you can also choose this field.
5. Teaching: You can do B.Ed and CTET. Then you can get a good teaching job in any reputed private school. You can also get a government job after qualifying exam conducted by State Government time to time. You can qualify RET exam and get admission in Ph.D and since you are NET qualified, you can get a job of assistant professor in any college, university or institute.
6. Civil services: You can do prepare for civil services also. Here you will have to choose subjects of your choice.
7. Marketing field: you can do MBA and get a good marketing job.
8. Chemist: You can also work as a chemist in any laboratory.

So, there are lots of options available. The main thing is your interest. Choose field according to your interest and caliber.

With your own submission, it could not be clear which examination you are referring to securing 59 percent marks. Possibly it may be the percentage marks of your M.Sc examination.
NET examination is conducted by CBSE twice a year ie in the month of June and December in each year for which the eligibility criteria to appear is to secure 55 percent of marks for the general candidates and for others such as OBC/ SC/ ST Economically weaker class etc suitable confession are offered in respect of eligibility criteria.
As per rough estimate, 6 lakhs of candidates appear for the NET examination on year to year basis and out of the figure mentioned 6 percent ie 36000 candidates are declared to have passed the test successful. Again there will be variance of the scores required to be successful in each subject.
Suppose for the subject, you have failed to secure the minimum cut - off, it would be better to try for the same in the next attempt so as emerge successful next time.
You do have a lot of options in the event of failure to achieve success in the NET test. You may try the following jobs.
1) Try for the Public Undertaking Jobs - Look out the post of Management - trainees, Administration appearing on the leading English - papers where in they indicate minimum of 60 percent marks in the graduation level to appear for this test. You will have to clear both for written and oral tests with your consistent labour.
2) Try for GATE with high percentile so as to absorbed in SAIL, GAIL, ONGC, DVC etc as the Mamagement trainee, Administration to be absorbed in Stores, Purchase, Inspection, Accounts etc depending upon your performance in such a test.
3) Prepare for LIC or Bank Probationary Officers Examination- In both the sectors, LIC and Banking the pattern of examination is similar at least in the written tests. You should be well versed in Mathematics right from secondary to graduation level, good command over grammar and wrillen English, Basic familiarity with English Composition and Statistics to clear the written test and in the oral test, You must have the presentation skill of the matters in the spoken English so as to impress Interview - Board. Your guidance from a professional Institute would help you to get through this test.
4) Opt for Independant Coaching in your subject - With your post graduation in Science, continue teaching in your pet subject and see how your income - graph raises with time. Form a group with the like minded enthusiasts of the different subjects and establish your own institute later on.
5) Prepare for the Civil Services Examination - Though initially it may appear to be a difficult assignment but with your devoted preparation and guidance from a professional institute such as T.I.M.E, Rao Study Circle etc, you may sail through.
6) Prepare for B.Ed - if you have the inclination for taking up the job of school - teacher, take appointment with the Principal of some high school of your locality and apprise him of your idea to coach the school students in your favourite subject and simulteneously start preparation of B.Ed. You may take up even IGNOU so that you can prepare for your subjects by studying in your convenient time.

You mentioned that you have qualified NET but did not mention about your rank. Once you qualify NET JRF, with good scores and good all India rank, your post-graduation marks hardly matter. So, I would suggest you use your contacts, your lecturers, etc who can help you out with some good projects in any government institute. Merely qualifying NET does not work and you need to apply or approach the Principal investigators of your domain with your SOP. If they find it interesting, they will accept you for a Ph.D. under their guidance. Another option is to accept any government project available in the institute of your interest.
On another side, if you have not socred good rank or scores, it would be better to appear in NET exams again with better preparations. By the time, you can join any short term projects available for postgraduates. This will give you the experience of a wet lab and am opportunity to make contacts in the field of research.
If this does not work, another option is to go for Lecturership in any government institute. NET qualified candidates usually get lecturership easily. Once you join, you can enroll for Ph.D. after some time in the same institute side by side.

Every year some NET cut offs in different subjects are announced by the authorities. These cut offs are different in different subjects. So you have to see the cut offs announced for your year of completing NET and check what are those in your subjects. These cut offs are different for different categories like General, SC or ST.

For example in July, 2018 the cut off percentage for general category in Economics for applying for lectureship was only 56% while for Junior Research Fellowship it was 66%. For reserved categories it was in the range 44 - 61%. There is some variation year to year but this example will give some idea about the cut off eligibility to apply for research or lectureship after NET.

I think you can very well apply for the lectureship or Junior fellowship based on your percentage in the respective NET exam.