Yes, you can switch from CBSE 12th to repeating 11th in state board, and then write JEE Main in 2027, but here are a few points to note:

• For JEE Main Eligibility you can appear three times in three consecutive years after completing Class 12.
• So if you finish state board Class 12 in 2027, your attempts will be 2027, 2028, and 2029.
• No issue with board change as long as the new board is recognized.

• Be careful about gap years, as some colleges may ask for a proper explanation or documentation.

Make sure your JEE Advanced eligibility is calculated from your latest qualifying year. So yes, it’s doable, just keep all paperwork ready and plan your preparation properly.

All the best!