The details a student can change in NEET correction window are:

• Personal details
• Class 10th academic details
• Class 11th details
• Class 12th education
• Permanent and correspondence address
• Birthplace, the medium of question paper, NEET exam centers  preferences.

So don't be tensed you can change your 12th pass to 12th appearing undoubtedly when the correction window will be opened after the last date of form submission. So no need to worry and stay focused.

For more NEET CORRECTION window details you can visit the link provided below:

https://medicine.careers360.com/articles/neet-application-form-correction-guide

I hope this answer helps. All the very best for your future endeavors!