I have completed my B.A. and now I want to do MCA. Is it possible to give any MCA entrance exam such as JECA or any other MCA entrance exam?

For MCA Entrance exam after BA, the eligibility criteria is you should have opted Maths in BA or 10+2.
You can find more details here:
http://www.hunt4career.com/articles/mca-entrance-exam-preparation
There are many institutes who are providing MCA without Math. Just consult some colleges and you will get your answer. Cheers.......