Is that possible to crack JEE MAINS in last 20days preparation ?If yes,then what will be the strategy for 20 days

Yes It is Possible to crack Jee Mains in last 20 days.
THINGS TO REMEMBER
1.Time Management Should play the most imp.role.
2.Maximum Chance of Gaining Marks Is Chemistry.
3.Try To complete Physical Chemistry +Modern Physics it will give you 12+4 questions in Jee Mains 2017.
4.In Maths 2D+3D gives you minimus 5 question and it is based on Formula Only. ALSO Probability is easy and min. 1question always asked in jee mains.
5.Optics covers 2 questions and electostatics cover 2questions.
6.Avoid wasting time and stick to time management and this topics and you will clear this exam.
7.Positive Attitude + Selfconfidence is very imp. While preparing.

8.Don't forget calculus.

Actually it is impossible but if u have a nice scope on ncert u can crack it and also u need to think just out of the box............. ALL. THE BEST