Computers & IT (Non-Engg)

Yes, you can apply for MBA in operations management as well as other fields of MBA if you want. Top B-Schools like IIMs, Xavier's, NMIMS, Great Lakes-Chennai, IMT, etc. accept CAT and XAT but NMIMS only accepts NMAT.

Hello Parth,
It's very nice to know that you have dreams of doing graduation after completing your diploma. There are many colleges in places you mentioned where you can realise your dream. In Gujrat, you can seek admission directly to 2nd year of engineering. Just score very good marks in your diploma. List of colleges is available on the web site.

The basic requirement to do a PhD is a Masters degree, so you automatically qualify since you have a MCA degree. To apply for Ph.D. you can either directly apply to the professors of
different universities sending them your resume , Statement of purpose
and your research papers. Or you can appear for UGC-NET examination
and then sending your NET scores to the professors under whom you want
to undergo your Ph.D. course.

Best Books for MCA Entrance Exam
IIT-JAM (MCA & Biotechnology ) Previous. & Practice Papers (Solved)
by
Editorialrph Board
Publisher: Ramesh Publishing House (2011)
Mca Master Of Computer Application Entrance Exam
by
R. Gupta
Publisher: Ramesh Publishing House (2008)
MCA Master of Computer Applications Entrance Exam
by
R. Gupta
Publisher: Ramesh Publishing House-delhi (2012)
TANCET MCA (Anna University) by V.V.K Subburaj
By
G. K. Publications Pvt. Ltd
MCA Entrance Of All India Universities
by
G.K.P.
Publisher: G. K. Publications Pvt. Ltd
The Pearson Guide to MCA Entrance Examinations
by
Edgar Thorpe, Showick Thorpe
Publisher: Pearson Education

Different colleges have different fee structures. Please refer to the link provided below for a list of colleges which offer B.Com in computers. You should be able to download their brochure which contains fee details of that particular college.
https://www.shiksha.com/accounting-commerce/colleges/b-com-colleges-india

Please refer to the link provided below for details regarding eligibility criteria to pursue DCA:
https://www.shiksha.com/it-software/articles/your-career-after-diploma-in-computer-applications-dca-blogId-4575

Please refer to the link provided below for details regarding course duration and fee structures for different courses at Arth Institute Of Computer Education. You should be able to download their brochure which contains all such details:
https://www.shiksha.com/college/arth-institute-of-computer-education-kalkaji-delhi-41326

Dear Ankit,
Yes, you can go for MCA from University of Mumbai.
Below are the links for your help.
http://mu.ac.in/portal/distance-open-learning/distance-open-learning-more-info/
https://www.shiksha.com/college/institute-of-distance-and-open-learning-university-of-mumbai-santacruz-east-10303
I hope this will help you in the best way. Feel free to raise more queries or you may close the question by liking it or marking it.
All the best.