Hello Prajj Ragh. Thanks for contacting Careers360 and we hope we will be able to answer your query. 

I understand that you aren't happy about your performance in JEE Mains as you would have liked it to be. Nevertheless, never underestimate your true capabilities. 

Plaese note that BITSAT isnt a very hard exam. It certainly is not like JEE Advanced. So, Plaese go for a thorough preparation for BITSAT from today itself.

Scoring 350+ in BITSAT isn't difficult, if you study with dedication and concentration. For the conceptual understanding and strengthening, Plaese study NCERT / CBSE topics of class 11 and 12 in and out. Simultaneously, you should study Arihant's BITSAT guide also.

The most important factor in BITSAT is your speed of solving. To improve your speed, practice as many questions as possible with an aim to solve within a minute. Try attempting some mock tests and experiment with various strategies of solving as you practice.

Also, please see here:

• https://www.quora.com/How-much-should-I-study-to-score-350+-in-BITSAT

Hope this helps you and all the best! 

The expected cut off for jee advanced is 80 marks this year and as far as for bitsat, one needs to score a higher range of marks in it to get admission in bits....so i suggest you to mainly focus on jee advance and keep bitsat as a secondary option . All the best