Hi

hope you doing well

Once the JEE Main correction window closes, NTA does not usually allow further modifications, including switching between papers such as from B.Planning to B.Tech. However, during the active correction period, candidates can modify certain details like course selection and paper preferences.

Since the correction window has already passed, you might not be able to switch papers now. If you've already registered and paid for both B.Planning and B.Tech exams, you'll likely need to appear for them as scheduled. Your best option is to contact NTA directly through their helpline or email to explain your situation. Sometimes, NTA provides special accommodations in unique circumstances, but this is not guaranteed.

Best wishes.