Hello Tripti,

Scoring at least around 300 in NEET is very essential for admission in a good government college in India. 

Yes, mtg fingerprints is a good book for solving questions, provided your concepts are clear and you are thorough with your syllabus nicely. If not, since you have only 20 days left, you can start by revising those topics that you find difficult. Solving lots of questions will boost your confidence and will help you learn about the variety of questions that can be asked in the all India exam. 

If possible, try to solve questions within a minute. This is because only if you save time in the biology section, you'll have more time to solve your physics questions.

Hope this information was helpful.

Good luck!