Hi Isha,

While your preparation is totally your court of practice it is advisable to be well prepared as GATE is a tough exam, however, to answer your question, you can refer to different test series like Made Easy and Ace Academy that come with a set of 65 mock tests each, of varying difficulty level, to help you revise your concepts more diligently.

The number of mock tests you wish to take before the final exam that's upcoming totally depends on your level of preparation and confidence. I personally advice you that with a little more hard work and focus, try to attempt as many mocks as you can just to get a hold on the pattern and identify which sections you need to work on more.

I hope this helps you, all the best!