You can consider below points -
1. You must have all formulas and equations (algebraic and chemical alike) on your fingertips.
2. The most important out of all the BITSAT tips and tricks is and most efficient is time management.
3. Of the three hours of the examination, spend no more than half an hour on Chemistry so that you can devote more time to other sections.
4. The lack of being capable to refer to any question of choice makes online tests especially challenging.
5. Once you opt for bonus questions, you have to submit your answers to the original 150 questions and you cant revert back to review those answers.
6. The BITSAT examination provides you with a negative  marks for every wrong answer.
7. Carrying 15 questions, English must be mastered well, given the cut throat competition in BITSAT exam.

Hope this helps!!!