IMUCET

There is no such scheme as free education. Scholarships are there. You can get maximum upto INR. 1 lakh as scholarship in every semester. You have to be the topper of the University for availing that. Otherwise, there are more scholarships like INR. 75,000, INR. 50,000 and INR. 25,000. So, if you have enough potential you can get back almost full of your fee paid. But, in every semester you have to pay the respective fees. The total course fee is INR. 4 Lacs where exam fees are excluded.

Total fees of B.Tech. in Marine Engineering in Tolani Maritime Institute- TMI is INR 17.60 Lakh.
https://www.shiksha.com/b-tech/course/b-tech-in-marine-engineering-tolani-maritime-institute-talegaon-dabhade-pune-71248

Checkout this link: https://www.shiksha.com/university/indian-maritime-university-chennai/imucet-exam-question-papers

Please visit the link below for the syllabus of IMUCET for UG Programmes:
https://www.shiksha.com/university/indian-maritime-university-Chennai/imucet-exam-syllabus

There's nothing called a cutoff mark for IMUCET they give you AIR. If u have a rank in 800 to 900 general than u may get admission there.

I don't think there is a correction window in IMUCET exam, as there is in JEE Main exam, you need to contact the official conducting authority for clarification.