Hello!

If you score less marks but you have got passed in the sense you can give improvement exam. Even you can also opt for NIOS syllabus, But NIOS will be much similar to that of CBSE syllabus. This is just an alternative if you want you can also opt for this one. But yes if you are not satisfied with the marks you can take the exam again.

ALL THE BEST. Hope the answer was helpful.

Thank You