BCA

You may pursue MCA after BCA if you wish to continue your studies. Else, you can start working from now on as well, you will get a job for the same.

Majority of college's mandatory eligibility criteria for admission in BCA is maths at +2 stage. You can do BCA but your choices for colleges will be very limited.

You can only do that if you pursue one of the courses in regular mode and other through distance learning.

'O' level computer courses are deemed equivalent to graduation in IT field. After completing your 'O' level computer course, you can avail good job opportunities.

Hello Nisha,
Diploma in engineering is a 3 years polytechnic course, which is not considered equivalent to Bachelors degree and the candidate passing it will also not be called a graduate, because you haven't acquired degree yet. After Diploma you should go for B.Tech then only you will be a graduate.

MCA is career route for BCA to become a software engineer, after that you can do M.Tech for teaching career or do MBA for management career.

You are eligible for MCA at Vidyasagar university as eligibility criteria is Graduation degree from a recognized board. Admission to MCA course is made on the basis of performance in joint entrance examination for computer application (JECA) held by the West Bengal Joint Entrance Examination Board.

Computer engineering will be better option.