B.Sc. in Science Colleges in Jehanabad

Bihar Agricultural University accepts the scores of the Bihar Combined Entrance Competitive Examination (BCECE) for admission to B.Sc. programs. The eligibility criteria for B.Sc. admission typically include:
Candidates must have graduated from a recognized board with at least 50% to 60% of their class 12.
Their core subject combinations in 10+2 education must be either PCM or PCB.
Biology must have been one of the subjects studied in the 12th grade for the applicant requesting.
The BCECE is a state-level entrance exam conducted by the Bihar government for students to be eligible for admission to any affiliated colleges.

IIT Patna accepts multiple state/national entrance exams other than JEE for admission to BSc courses. NEET, CUET, BITSAT, etc., are other exams accepted by the institute. However, candidates must make sure to first qualify for the BSc eligibility criteria. Qualified candidates just need to apply via the official website of IIT Patna. 

BSc eligibility criteria: Class 12 in Science Stream with 60% aggregate

Yes, Dr. Rajendra Prasad Central Agricultural University does offer BSc in Forestry. The he programme is offered in one of the affiliated college of RPCAU i.e.,  Pt. Deen Dayal Upadhyay College of Horticulture and Forestry. The programme lasts for four years and is offered across eight semesters. Candidate must have twelve years of school education with PCB/PCMB/PCM to be eligible for theBSc in Forestry. Further, students must also participate in the ICAR AIEEA (UG) exam to qualify for BSc admission.