CA

Obviously, It is allowed.

If you want to become a civil engineer then you are advised to do class 12th with PCM and appear for engineering entrance examination. If you want to become a CA, you may do class 12th with commerce as a main subject.

Hi,
Yes, you are eligible for bank exams because bank exam has only one criteria of completed graduation with any discipline from an authorized university.
IBPS conducts the CWE exam for public sector banks or RRB Banks for the post of clerk, PO, SO.
IBPS doesn't ask for the percentage, they only ask the candidate to be passed in graduation.
Apart than this, if banks conduct their own exam, they ask for a minimum percentage of 60%.
Clear all your doubts here - https://govt-jobs-exam.quora.com/IBPS-PO-Aspirants-Clear-5-most-Common-Doubts-here
All the best!

Yes, you can obviously pursue it but you need to learn every concept of accounting, tax, laws etc. from the scrap. I have seen 100s of commerce graduates not able to clear CA exam after 5-6 years. So, kindly research a bit before you make your decision because if you make a wrong decision here it will cost you your whole life. Think about it see if you can reach somewhere with your MCA career. What do you exactly want to do among working in corporate after MCA or CA by devoting a minimum of 3-4 years of your life. All the best.

You need to qualify CPT of CA to pursue CA. Visit the website of ICAI to enroll or to get more details.

Yes, you can. You just need dedication and passion for CA.