Geology

You have to qualify in BHU UET. Board performance doesn't account for any weightage in the entrance Exam i.e. UET. Though you have to score a minimum set of marks which are expressed in the UET prospectus ( Differs for General, OBC etc. )
After you have appeared for UET, the marks you obtain will be crucial in determining whether or not you will be allotted Geology Honors because It is one of the most sought after Honors course in the University.
There are three subject combinations which involve Geology Hons :
PMG Physics MATHEMATICS, GEOLOGY)
BGC (BOTANY, GEOLOGY, Chemistry )
GGC (GEOLOGY, GEOGRAPHY, CHEMISTRY)
BGC & GGC are for students with Biology background in 12th while PMG is for students with Mathematics background.

M.Sc. In Geology is a 2-year postgraduate course approved by the UGC. For most of the institutions, including those providing distance education, eligibility for admission to the M.Sc. In Geology requires studying geology at the graduate level. One cannot do an M.Sc. In geology after completing a B.Tech in civil engineering because the eligibility criteria are graduation in B.Sc. Geology or applied geology. However, if you have an interest in geology, then you can apply for a M.Tech in geology provided by top colleges like IIT Kanpur. The M.Tech programme in Geological Technology offered by IIT Kanpur has a focus on applied Earth Sciences and consists of 2 semesters of course work and 2 semesters of research. Candidates who possess a B.Tech. Degree in civil or geoscience engineering are eligible to apply for the M.Tech.