How should I study for the GATE from now if I want to get into IIT, Patna?

If you want to study for GATE to join IIT Patna, you can start by joining the test series. Made Easy provides a very good test series in addition to the ACE test series. Other tips to follow are

• Give a minimum of 2-3 tests in a single day and revise your concepts daily. Giving tests will teach you how to handle pressure, time management, strategy, etc.
• Give equal importance to every subject and do not focus on one subject only. Revise every subject alternatively.
• Make sticky notes and jot down your weak topics to revise them more frequently. 

Follow the above points sincerely and you are good to go.