Question papers are not available online. They are not uploaded by the board. You have to practice as per the syllabus. You have to make your preparation strategy to cover the syllabus within due time such that you will get enough to time to test and retest yourself.
If you know any person for the institute who have appeared SRMGEET then you can ask him/her regarding the paper level and how they cracked it.
This will tell you how you should improve yourself so that you can also crack it to get an admission.
Hope it helps!