Science

IMUCET is a very easy exam indeed. You just need your basics to be as clear as possible. See, stick to the class 12th syllabus mostly. For Maths coordinate, algebra, little bit complex number, calculus and integral calculus is enough. For physics 12th syllabus is enough although I would recommend you to study 11th materials too. I was personally never confident about my 11th concepts. For Chemistry, do the physical Chemistry properly. Now for general knowledge part, go without preparing I would say, it would come natural to you. Do well! I was expecting under 100 rank but eventually landed in 600's. And, if you are really interested in merchant navy, message me your doubts further for good maritime college and whatever you feel like.

Dear ManuShree!
Generally, in for Bachelor's in Data Science, you need to be from PCM background. But still, there are some who are working as a data analyst after commerce background. For specific degree, you need to go for 'Statistics' (some university asked you to be from Science stream for that). But in addition, you need to be excellent in Programing, Deep Learning, Machine Learning, Neural Network, Data Visualisation etc. Coming straight to your point, you may check the website of "SP Jain University". It's one of the greatest college in India. They currently started a Bachelor course in Data Analysis. Just have a look there. Hope this helps. Upvote the answer if you feel satisfied. Ask any query at anytime.
Good Luck.