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No, these will change every year according to number of students participated in concerned entrance exam.

Yes, you can get it but you have to study B.Tech first year again.

Sorry dear, but 21 marks are not enough to grab you any govt. college.
You should try for any private college which offers admissions through direct means instead of JEE Mains rank and score.
All the best.
Please upvote my answer.

45 out of 720 is for SC category.

Career Definition for a Marine Engineer:
Education:
Bachelor's degree required
Job Skills
Strong math and physics skills, independent thinking, teamwork, patience
Median Salary (2015)*$93,110 for marine engineers
Job Growth (2014-2024)*9% for marine engineers

Yes, you can no problem everything depends on your knowledge and skills. MCA Is surely good but needs MH-CET for admission and also in Maharashtra MCA-Science is closed. Available courses are MCA-engineering and MCA-management. I would prefer you MS if your from bcs background otherwise no difference in MS and MCA.

Refer the below mentioned link:
https://www.resonance.ac.in/reso/news/JEE-Main-Branch-Predictor.aspx

Yes, BITS is a reputed institute for engineering.

Hi,
Please specify the examination in which you have got this rank.If this is for VIT then you have no chances because only first 100000 candidates are called for counselling.
If this is for JEE then you cannot get NITs as first 200000 ranks are those who are qualified for writing JEE Advanced as well as they stand a chance to write JEE Advanced. You had to apply for the other colleges which accept both JEE main scores as well as board exam scores.

You do not qualify for the same. The cutoff for ST category is 27.

It won't be a good decision to take one more drop for JEE. Its better to join a decent engineering college through your JEE Mains score. Because drop will affect you in your career in later stages if you are not able to clear JEE next time. So, in my view, you must join a engineering college this year.

Yes, you can if your rank is under the required rank for this college.

As you are in 2nd year of B.Com and you are thinking of appearing in CAT than you must start the preparation. If you have good hands on basic maths (algebra, trigonometry, equations, coordinate geometry) than you can practice at home for logical and verbal. You can also join a coaching to sharpen your verbal skills. They do have a proper schedule and format of preparation. Along with coaching weekly tests will also assist you in your preparation. Even if you are not joining any coaching you must join a test series to evaluate your performance.