can we choose any three subject from physics chemistry, maths ,biology,and agriculture for ICAR ALEEA?

Physics chemistry Mathematics

As per the official notification for ICAR AIEEA- UG it is:

For AIEEA-UG-2017: (Other than Veterinary Sciences) Must have obtained not less than 50% marks in aggregate in 10+2 examination or equivalent with PCM/PCB/PCMB/PCF subject combinations/Inter Agriculture for admission under General, UPS (Under Privileged State) and OBC (Noncreamy layer) categories or 40% marks in aggregate for admission under SC, ST and PC categories. However, candidates with PCF combination are eligible for admission to B.Sc. (Horti.)

So yes you can choose 3 subjects as well.

Rest updates and notification you can even check here .

Good luck!