i wanted to choose more iims.. I've already submitted my form.. can i make any chnges?

Hey,

If you make mistakes while filling the CAT application form, then you are allowed to make some corrections in the application form of CAT 2019. Certain entries are editable after form submission. Only those fields, which are allowed to be edited during IIM CAT 2019 Application Form Correction will be changed.
Application form correction of IIM CAT 2019 will be available at iimcat.ac.in. soon.

IIM will allow the candidate to make certain changes after the application receiving date is over. For that purpose, IIM will activate a new window for some time using which the candidates may be able to make the necessary changes. To exercise that facility, candidates will have to check in to their IIM account via (I) Username and (II) Password on the official website at iimcat.ac.in. Here you will observe the link that will take you to application form correction link. The same will be executed within the prescribed time.

Hope this helps.