Hey Aspirant!

You can prepare for NEET 2020, but remember, as you've passed 10+2 long ago, you'll need to practice more, since the revised structure has apparently been erased by now. So, prepare yourself for the best, do all the chapters again, they might not be as much tough, because you've already done them, and try staying away from any distractions. 

Hope it helps you.

Best of luck!