Hello,

You can fill as many choices but in order of preference. Candidates have to use their JEE Main application number and Main/Advanced password to login on the candidate portal of JoSAA. All the information about candidates will be fetched from the database of JEE Main registration.

Visit this link for more information-

https://engineering.careers360.com/articles/josaa-registration-and-choice-filling

I hope this will help you.

All the best !!