Yes, since you passed Class 12 in 2025 and want to improve your marks, you can apply for the 2026 CBSE improvement exam as a private candidate. You don’t need school help for this CBSE will release the form on their official website around October to November 2025. You’ll need to fill it online and select the subjects you want to improve.

The improvement exams are usually held along with regular board exams in February March, not after the declaration of 2026 results. So you’ll be writing the paper at the same time as regular students.