BITSAT is one of the crucial exam for the non medical stream . In BITSAT you need to learn every concept and your problem solving skills and timing must be good because as exam is not much tough but it is lengthy so as cut off goes high also. Mostly questions are conceptual and theory based .
So you should try to improve your timing skills and efficiency by solving BITSAT sample paper in less time than provided.
BITSAT will cover all the syllabus required for getting a good score in VITEEE also BITSAT is better college than VITEEE or some of NITS and IIT s also.
Yes, BITSAT prep. will be enough for VITEEE exam. BITSAT is tougher than VITEEE exam. VITEEE has 125 questions total and most of the paper is picked up NCERT books. And if have prepared for BITSAT then you can tell that BITSAT does not ask question directly from NCERT. But do one thing before VITEEE solve its previous year paper so that you can get the idea of pattern of exam and level of questions in the exam.
I hope this answer will help.
All the best for the future!!