Hello,

When you switch from CBSE to NIOS after failing the chemistry compartment exam, the process for practical marks depends on specific regulations:

1. Practical Marks Carry Forward : If you switch to NIOS, your practical marks from CBSE might not carry forward automatically. NIOS typically requires students to appear for both theory and practical exams, as it operates under different examination guidelines compared to CBSE.

2. Giving Practicals Again : Since you're transferring to NIOS, you will likely need to appear for the chemistry practicals again as part of the NIOS evaluation process. This applies regardless of whether you opt for the on-demand examination or the October session. Both exam modes under NIOS would require you to complete the practicals anew.

It is essential to confirm these details with NIOS directly or through their official guidelines to ensure you're following the correct procedure.

Hope it helps !