Hello aspirant,
You missed the application window for the Bihar Board Class 12th Improvement Exam for 2024, which typically happens around March-April. The next opportunity to take the improvement exam will be in March-April 2025 .
You are not eligible for compartment as the compartment exam is for students who failed one or two subjects in the 12th board exam. Since you secured 65% marks, you wouldn't be eligible for the compartment exam.