Hi Raj!
To be eligible for MCA, candidate either must have mathematics in 10+2 or must have completed BCA as undergraduation or mathematics as a subject in UG. If any one of these three conditions satisfy then he/she is eligible for MCA.

But as you mentioned that you have neither taken mathematics subject in 10+2 nor in undergraduation, then you are not eligible for MCA.

Also, as you mentioned that you wish to swtich to the IT industry then I would suggest you to go for some different IT courses and learn through them via online or offline mode. But make sure you choose the right course and it must end with an internship (paid would be considered more valuable). And then after getting a recognized internship certificate (especially from an IT company), you can get yourself an IT job.

Also, there are many companies which conduct hackathons or other coding test to hire the students and these companies do not require any IT specializations or degrees they just hire your on the basis of your coding skills. To name some them, HCL, TCS, Infosys, Google, microsoft and much more.

Hope I answered your query, thankyou!