See cutoffs for any particular year cannot be predicted so easily as they depend on lot of different factors like number of candidates appearing and also the paper level difficulty, etc. So they cannot be predicted as all. The cutoffs might increase, might decrease as well none of us know. But they usually vary in a particular range only. As you told BITSAT 2019 cutoff to be 397 for Computer Science Engineering Branch, it usually has stayed in that range only for past years. So I guess at 350 marks it can be a little difficult for you to get into Computer Science Engineering Btech Branch.

So try to aim for more higher marks to ensure your seat.

Kindly refer to the links below for more detailed information..

https://engineering.careers360.com/articles/bitsat-cutoff

To check the 2020 exam updates about bitsat and also the syllabus and pattern etc refer to the link below...

https://www.careers360.com/exams/bitsat

Best wishes. Thank you.