After confirming my seat by reporting at ARC after Cap 1 in MHCET and not freezing my allotted choice
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NO, you don't need to report to ARC again.
You just need to go to the alloted college and confirm your Admission by paying the College fees and submitting the required documents.
Hope this helps you.
Thanks.

Hello!
Kindly check out this link. Your query will be answered in detail-
https://www.google.co.in/amp/s/engineering.careers360.com/articles/mht-cet-counselling%3famp
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