Hi Manasa ,

Based on your rank and caste and the branch you pick they will allot your seat in particular college and as per your question Icet exam is entrance exam for both the courses and yes you can even put few mba colleges and few mca colleges at the time of counselling No worries , yes you can change

for more information go to below link

https://bschool.careers360.com/articles/ap-icet

I hope this information is helpfull

ALL THE BEST