MCA

Watch the video from the link given below. It allows you to predict the college which you can get through UPSEE rank basis. https://youtu.be/hOlit6Un7l0
Still have any confusion write in comment.

What is your current year in BCA? If you are in the last year and going to give the final year exam next year then prepare for NIMCET or if you are completing your BCA this year then you can join Galgotias, Amity, GL Bajaj, CU, LPU, Sharda, etc.

Yes, you can apply you are eligible for MCA entrance exam of SPPU.

Hi Ankit, find your best suitable college with the help of Shiksha. Com : https://www.shiksha.com/it-software/colleges/mca-colleges-india.

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 graduatio

Please refer to the link provided below where you can download college brochure which contains details regarding admission protocols followed to secure a seat in Fergusson College (FC Pune) for MCA.
https://www.shiksha.com/it-software/course/master-of-computer-applications-mca-fergusson-college-fc-pu

Two things, one the answer by Partha - tough to shift from commerce to Science. So, probably an MBA or an MS in Finance are options, but not MS in the Science stream. Second, US typically requires a 4 year UG education. B.Com is only for three years, and so 1 year M.Com may be needed.