Science

Yes, BHU offers microbiology as occasional hons which is equivalent to hons., so you can appear for any all India examination in microbiology for masters and no any university or college refuse.

Banasthali University is the best university for studying M.Sc Textile which is situated in Jaipur other than IIFD-Chandigarh, MPUAT-Udaipur, CCAU-Hisar, Haryana, etc.

35 is the passing marks out of 100 in mathematics.

Engineering will be helpful than M.Sc. You will find a lot of opportunities and practical experience in B.Tech rather than M.Sc but B.Tech is not a good option, you should go for M.Sc first then direct M.Tech in chemical engineering as M.Tech requires Master's degree or 4-year engineering programme.

The Maharaja Sayajirao University of Baroda in Gujarat and KSKV Kachchh University in Gujarat.

If you come in category like ST/SC OBC, then only you can.

If you want take admission in M.Sc. (Physics) through JAM, you should have physics in your final year of B.Sc.

Go for MCA degree but before it learn basic programming languages like C, C+, Java and understand all the basics clearly in your mind. Participate in competitive programming in Hackerearth, hackerrank, codechef, etc.

You can get them here http://www.uniraj.ac.in/examination/uratpg2014/modelpaper.php.