Dear Babu, with 435 marks out of 600, you stand approximately at an average of 72.5. And you will be eligible for any course that you wish to study post 12th. Because for most entrance examinations, the minimum aggregate is 50% for General Categories and there is relaxation for Reserved Categories. CBSE has released a list of 113 courses that students are available for students after 12th in every stream. You can check them at their official website. Alternatively, you can appear for NEET for Medical, Dental, Ayush and Veterinary Sciences. You also can appear for ICAR AEEE, Pharmacy entrance Examinations. You can study B.Sc in Agriculture/Forensics/Psychology/Microbiology/Biotechnology/BioChemistry/Biology/Physics etc.