Colleges in Kolkata

You can absolutely apply for the course regardless of the year you completed your 12th in.

Yes, you are eligible.
http://clc.du.ac.in/Notice/Revised & Corrected Bulletin of Information, 2018-19; 19.04.2018.pdf

Hello Rakesh,Invariably when there is demand someone makes these available. I am sure if you google you will find different agencies offering these services. In addition coaching institutes that offer to coach for entrance exam will surely have this. Be that as it may, I am attaching a link of Jadavpur University that gives out downloadable ZIP file of question papers that you want. http://admissionas.jdvu.ac.in/juarts/jadavpur/qstn.html

It would be better, if you have marks above 60% marks. So, that you will not be facing any problem during campus placement.

Yes, you can apply in any stream. If you had Maths/Computer, then you can apply for BCA.

No, not completely, as both of the courses are different.

Dear student, you can visit our website www.iihmca.org and download the application form and mail the filled in application form to iihmca@gmail.com

The admission letter will be mailed to you by mid week of May.

Hi,
Aptech does not guarantee job placements. Moreover placements are at the sole discretion of recruiters. Though some of the good companies do visit the campus for the placements.
Regards