Colleges in Karnataka

I would suggest you to go with SJIBIT as its placements are around 99.89% as per NAAC and it has been graded 3.2 by the same. Overall, it is the best college.

Don't go with Manipal University. It would be better if you go with Amity Distance Learning University. Read the article about Manipal University and Amity University:
https://topdistancemba.com/amity-distance-mba-admission-courses/
https://topdistancemba.com/2017/12/22/sikkim-manipal-university-mba/

You won't get anywhere if you come under general category.

That also depends on your category.

You should start solving the question papers because time is the most important factor during this exam. Start solving the papers with equal time limits. At the end of the day, refer the topics that you are lagging in.

Below is the eligibility criteria to get admission in B.Sc, at Mount Carmel College:
1. You need to clear class 12 or equivalent exam from a recognized board.
2. You need to study the language (second language) studied at the last qualifying examination.
https://www.shiksha.com/college/mount-carmel-college-palace-road-bangalore-24896/admission#admission

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BCA in Christ University, Bangalore no BCA cutoff. You will be able to apply with your 10th and 11th class mark sheets. Selection is based on entrance test and personal interview, marks won't matter that much only condition is you should not have any backlogs in 12th class results whenever announced. It's all about how you perform in interview and test. Sometimes, even good scoring students cannot clear the interview.