Dear Kashish,

      The minimum marks required is primarily based on the score obtained in entrance test.  The number of candidates appearing for the test. Authorities will prepare the admit list of BITSAT 2019. The BITSAT 2019 admit list will carry the names of candidates who will be shortlisted for BITSAT 2019 and the counselling process in different Iteration sessions. The cutoff for BITSAT Computer Science Engineering 2018 was 378. 

Wishing you all the best

The cutoff varies year to year but to get admission in BITs Pilani try to score more than 380 to be the safest score for Computer Science. You can also consider 2017 BITSAT cutoff with the given below link.

http://bitsadmission.com/cutoffscores2017.aspx

Good Luck!