Computers & IT (Non-Engg)

Average monthly salary offered to any BCA graduate ranges between INR 20,000 to 25,000. As a fresher, an MCA professional can expect anything around 2.4 to 3.4 Lacs per annum. Top companies hiring BCA and MCA graduates are Accenture, Infosys, Wipro, TCS, Cognizant, IBM, American Express, HCL, HP, etc.
Regards.

Top BCA colleges in India are mentioned at the link provided below. This ranking is based on college rankings published by India Today.
https://www.shiksha.com/it-software/ranking/top-bca-colleges-in-india/96-2-0-0-0

Yes, UK is the only country that offers 1-year Master's degree. Many universities like Oxford and UCL offer 1-year MS in computer science.

Yes it's good choice but placement is average around 4 lacs per annum.

IT Security & Ethical Hacking is a full-time certification course. It won't be possible to pursue this course along with your BA.

Hi,
Eligibility for MCA:
Any graduate who has passed or appearing for the final year degree examination in any discipline (science, commerce, arts, engineering or any approved university) is eligible to apply. Candidates must have mathematics as a subject in their 10+2 course or any one year of graduation.

Since you have done your 12th from commerce therefore you cannot pursue BCA, B.Tech (CS) or B.Sc in computer science. However, very few colleges have approved to those students who haven't studied in 12th. Also, you can pursue Diploma in CS. So go for Diploma and do hard work in it.