Originally Posted by maliasghar

The level of grammar as expected from a student of FA/FSc. The main things you should be preparing are:
Active Passive
Direct Indirect
and Sentence correction (which are the basics of noun, adverb, preposition etc)

For this you can get hold of any FA/FSc level Grammar book or 'Oxford Grammar book. Other good sources are (i) Direct Indirect Made Easy and (ii) Active Passive Made Easy (small thin books written in urdu/english)