Hello dear.. No ICAR is not compulsory for admission in B.Sc course. But at the same time , if you will not appear for ICAR exam you will not be able to apply in government colleges/Universities and also for ICAR affiliated colleges and Universities. But need not to worry there are many Colleges in Tamil Nadu that demand for board merit for admission in B.Sc course. Given below are some Colleges you can consider that.

1. Tamil Nadu Aggriculture University- Tamil Nadu.

2.Adhiprakashakthi Aggriculture College- Chengalpet, Tamil Nadu.

3.Agriculture College And Research Institute- Killikulam, Thoothkudi.

4. Agriculture College and Research Institute- Thriuvanthpuram, Tamil Nadu.

Admission process is expected to start from 18 May 2019 to 31 August 2019.

Hope the information helps.

Good Luck