If you have entered the wrong college accidentally while filling out the JEE Main application form then it should not affect your ability to attend the exam. However, it is important to fill out the JEE Main Registration Form carefully as errors in details like college preferences could create issues during counselling if they are not corrected. These are the following steps that can be taken as possible steps -
Correction Window: NTA usually opens a correction window for JEE Main application, allowing candidates to correct errors in specific fields. Check for any mistakes and correct them.
Impact on Admission: If not corrected, incorrect college information might affect your JoSAA counselling process, as preferences should match your intended choices. However, this error alone should not impact the eligibility for the exam itself.
Contact Support: If the JEE Main application correction window is closed, you can reach out to the NTA’s support team for advice. They can provide guidance on whether this correction can be made later or if it will impact your application.