Hii Ritamay!
Yes, you definitely can give the ICAR AIEEA 2020 entrance examination with PCB subject combinations. The Eligibility criteria for ICAR AIEEA states that the student must have passed class 12th with atleast 50% marks in total in physics, chemistry, and biology/ agriculture as main subjects. So, you are eligible for giving the exam. You can refer the following link fir more details -
https://www.google.com/amp/s/university.careers360.com/articles/icar-aieea/amp
Hope this helps.
Good luck!