There are only 15% government college seats allowed through ICAR exam.For general category 65-70% marks will assure to get a good college all over India.

General - 400 marks and above

PC- 270 marks and above

ST - 300 marks and above

It also depebds on your caste, as the cutoff is different for OBS, SC, ST . Since you haven't mentioned which category you fall into I've mentioned these.

Hope this helps you.