Science

For better career opportunities, B.Tech will be a good option as compared to B.Sc.

No government jobs are available after B.Sc biotech for sure, even after M.sc also no grantees as you will be provided with one fellowship programme under the Dept. of Biotech, India. They will be providing you different training programmes in private companies, if got selected through those companies, that would be fine. If not, again you have to carry your resume to all companies. But one should apply for the Dept. of biotech, India in the beginning of the 3rd starting itself. No guarantee that you would be able to get the opportunity in that fellowship.

Based on you subjects on 10+2, you are eligible to seek admission in B.Sc (Hons.) chemistry. You are advised to look at your targeted university last year's cut-off to check whether you will get admission or not.

Naseer, the eligibility of M.Sc IT is
Pass with 50% aggregate marks in Bachelors degree (any discipline) or equivalent.
Check the link for more details
http://www.lpu.in/programmes/all/Graduation/Computer_Applications_and_IT/M.Sc._(Information_Technology)#Details