Hello,
Most institutes offering the course admit students based on their performance in a relevant entrance test. Some institutes conduct their own entrance tests for offering admission. Admission process generally varies across colleges.

A few institutes also provide direct admission based on the candidates score at the 10+2 level.

Candidates who have qualified the All India Entrance Exam of ICAR are eligible for admission to agricultural universities that offers forestry courses
I hope this solves your concerns
Best of luck!!