You have lot of time for Preparation as of now.
Apparently, you can join coaching Institute like TIME, Careerlauncher, IMS, CPLC, CATking feom secind year for CAT preparation which can be attemptes only from last year onwards with Minimum 50% in graduation as eligibility criteria.
A minimum of 90 percentile in CAT is must for agribusiness management course in IIM Ahmedabad and Lucknow for PGP.
Once you start with Preparation, you would need to appear for mock tests to gain enough confidence.
You can refer to books by Arun Sharma, Nishit Sinha, TIME Coaching Material.
All the Best.

you can join coaching classes For CAT ..The best coaching institute for CAT are TIME  & BYJU...in both the institute you can even take the classes through online if you are not able to go for calss every weekend

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