Science

If you are interested in B.Tech biotechnology, then you should ready to complete Ph.D in biotechnology because very least number of opportunities are available for under graduation and then you should ready for research line. If you are interested in these things, it will be the best opportunity ever.

Christ University is good for CS.

There are two branches of B.Sc (Hons) maths seats distribution in BHU. Faculty of Science and MMV (Mahila Maha Vidyalaya). Faculty of science contain 460 seats which are common for both boys and girls. MMV (Mahila Maha Vidyalaya) contain 77 seats which is only for girls.

I am sorry JS but I don't think there is any such provision of getting a direct entry to 2nd year directly after 10+2. You have to pursue from the very beginning i.e. from the 1st year. But if by any means you are not able to pursue B.Tech, then you can pursue a Diploma in the related stream and then take a lateral entry to B.Tech 2nd year.
Thank you and best of luck.

Most of the colleges and universities conduct entrance examinations but there are certain colleges which take admissions on 12th marks merit, so you have to search for them.

Chemistry including both quantitative and qualitative is a very important part of the syllabus. In no way, you should leave any one of them. Chemistry overall contains 60 marks out of 200.

If you're going to opt for MBA as your Masters degree anyway, it's better to go for BBA in the initial run.