What are the best subjects and colleges for the Preparation of an IFS exam?

Presently i am in class 12th . I have SCIENCE stream with PCB.I want to know that which degree should i take and please tell me what all are the subjects and best college for preparing my IFS.

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for indian forrest services the syllabus is:
agriculture
animal husbandry
physics
mathematics
zoology
botany
statistics
he/she should be a grad in the above subjects

List of coaching centers for IFS exam in Delhi:-

1.Escholar India Delhi

2.I quest commerce Academy Delhi

3.Karmachakra Academy of professional studies Delhi

etc..

These are top most IFS coaching institutes in Delhi..
So, you just check these out