Hello
you can do M.A. in english b'coz the degree of b.tech is completelly graduate degree & M.A. (any discipline) can do after graduation. so you are eligible for M.A. most of the university have course of M.A.(english,two years or four samesters) & prefer 50%marks of graduation.

many university also conduct entrence exam processing, so you can see syllabus official website of them.
Books are available in market(basically syllabus pattern will be same in gdaduation lavel in english sub.). In actual you can take help or guidance from english teacher.
Hope it helps