There would not be any problem in case you want to switch over the present assignment from the Corporate - sector to Teaching field. Options are not limited in the teaching profession, what is required is a cool thinking in the present scenario so as to adjust yourself with the changed profession.
MBA is one of your basic qualification and if the same is Human - resources, you could appreciate your positive traits which would make your career growth smooth.
As you have indicated Mathematics was one of your subjects during the graduation - stage. This subject if you so far remember the different portions such as Algebra, Trigonometry, Calculas, Dymamics, Vector and so on, this should be your fascinating resources in taking up assignments as a Mathematics- tutor or even the organiser of a Coaching Institure where 10+2 students are groomed further to have a seat in IIT or any prestigious colleges. In case, you want to lead as organiser apart from your involvement in Mathematics, you need two your friends interested for coaching in the subjects Physics and Chemistry respectively.
This combination would work fine in terms of earning and passion.
College Lecturership would take a lot of time in the preparation of NET and calls for your studies in the same direction.
However, make a career with your your own inclination so that interest in such an avocation is sustained.