Hello Krishan,
Yes you can apply to Forest Research Institute as in many courses the basis requirement is for the maths subject and in many there are requirement for the bachelors degree in any course
Here I am sharing a link with you which will help you out
https://www.careers360.com/university/forest-research-institute-dehradun
Hope this will help and you can ask for more clarification
Candidates can check B.Tech Cut off for Top IITs & NITs here.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile