I hope you are referring to the ISRO exams for scientist/Engineer.ISRO Entrance exams 2018, written exams are due in May 2018. The results of this are expected to be around Oct/Nov 2018.The written test is the first round. Original documents will be asked when you are called for the next step which is the interview process. Here you need to have the documents. It you score 60% and above in the interview, then you will be considered the final selection process done by the authority. So you still have time
If you look at the eligibility criteria. It is BE/Btech or equivalent with a CGPA of 6.84 or minimum marks of 65%.
Final year students are also eligible to apply 'Provided'you can submit the final degree by 31st October of the year you complete the degree.
So, this is your first rounds, wherein the online education details submitted by you will NOT need to be verified now. Please download the exam hall ticket. It would have instructions and what documents to carry. It would usually be proof of Identity, you can carry a letter that you are a student of the college. Please focus on your preparation, once you finish and get selected for the interview stage by then you should have your degree and the final marks certificates.