Hi.this is abhishek srivastav,.i completed my m.sc. biotech and now i wanna do preparation for forest service,.which book vil be gud.

Hi.this is abhishek srivastav,.i completed my m.sc. biotech and now i am working in a health care company in bangalore but i wanna do preparation for indian forest service,.which book vil be gud.plzz publication vil b gud.help me,plzzzzzzz