In MHT-Cet the additional round is the round for government colleges only.
You fill the option form the same way you fill the option form of the previous cap rounds.
But in this round ,  you can only fill government aided colleges.
There's no risk in it.
Centres where additional rounds are held, Aurangabad, nashik (sometimes ) etc.

Hello Abhishek,
Additional round in engineering counseling is CSAB special round. Special round will be conducted after the JoSAA 7 rounds. CSAB will conduct two special rounds for NITs, IIITs, GFTIs colleges. Hope it helps.
Thank you.