Hi

Every state has CET, if you are pointing to Maharashtra CET then since introduction of NEET they have not made it compulsory, meaning you can choose one of it depending on what you want to pursue as it is mainly for engineering ,pharmacy and agriculture courses.

The online form has 3 choices in the drop down list as PCB with biology as main subject , PCM with mathematics as main subject or PCB and PCM both. They have 2 sessions in one day for PCB and PCM papers if you are opting for both then you will have to appear for both the whole day. If you are crystal clear on what you want to pursue then pick only the choice apt for it.

Hope this helps. If this was not your query please let me know.