MCA

Yes, it is mandatory for the MCA programme.

No, you can't because eligibility criteria is that you have to clear entrance at first. Then only, you can take admission.

You must require around 85+ percentile for getting admission in MCA.

Use MAH CET College Predictor :
https://www.shiksha.com/mba/resources/mahcet-college-predictor.

Check out the MHT-CET predictor below:
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor

Please refer to the MHTCET predictor below:
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor

Getting a good job depends on your skills and profile. Yes, college matters for the sake of learning and placement, but a good student will get a good job even if he or she studied in a small college. Also, if you are planning to do BCA then checkout other equivalent courses like B.Sc, IT/CS.
All the best.

Hello Asish,
There are several colleges admission procedure for MCA is direct admission after any graduation. But, top colleges conducts its own entrance examination or accept state level entrance examination score like TANCET, KMAT, PUCET, etc.
All the best for your future.