No, you cannot appear for the Indian Council of Agricultural Research exam(ICAR), until you complete your class 12 from CBSE, or any equivalent from a recognized Indian board or University.

If you fall under general, OBC,UPS categories, then you should get atleast 50% aggregate marks in 12th.

If you fall under SC,ST,PC categories, then you should get atleast 40% aggregate marks in your 12th.

For more information about ICAR eligibility criteria use the below link.

https://www.icar-aieea.org/