I believe through MCC portal you are applying to colleges via All India Quota. If so you must remember that if you get a college in the 1st round then you have an option of either visiting the college or not.

1. If you visit the alloted college for admission then you will be applicable for 2nd counselling for upgradation.

2. If you do not visit the college then you are not allowed to participate in round 2. Then you can always apply for UP counselling.

However, whatever college you are alloted in the second round of counselling it is mandatory to take final admission there, you don't have the option of not visiting and you can't apply for any other college.

Hence, the colleges you choose in the second counselling of AIQ should be done keeping in mind that this may be your final college. Make sure your options are better than the colleges you can get via state quota so that you won't be upset with the college you get.

If you are unable to get a college through 2nd counselling then the college alloted to you in the 1st counselling will be your final college. If you don't want that college beacause state counselling provides you with better options then you must withdraw your admission before 2nd counselling ends.

I hope this helped.