Hello aspirant , it is great to see your enthusiasm . You have time in your hand . You should start revising your first and second year syllabus. Refer NEET PG ten years question bank, go get the idea of paper . Focus on those area from which more questions are asked , this can be done only when you would refer ten years . Don't miss you ward posting , you need to have ractical knowledge . Whatever you have studied is ofno use , if you don't have practical knowledge. 
After college and clinical shift revise your lesson , brush up 1st and 2nd year's notes. Solve question papers and give mocks to analyze your level. Work on your weak area , sheher it is Antonyms , niche mistry , physiology or any thing else. 

All the best