Hello, 

The answer to your question lies in your priority, in addition to your interest and skills. 

If job is mandatory, go ahead with PG but do remember it's important that you pursue studies in a college that imparts quality education, since your aim for doing MCA is to hone your skills academically as well as professionally, for better job prospects. Also, as you said, you have non maths background, so look at the areas where you didn't fare well in exams, and work on those diligently if you aim to pursue MCA. If job is not mandatory, just pursue MCA. Anyway, managing both will anyway be an arduous task. 

If none of this interests you, then don't go for it, just evaluate your skills, areas you're good at, your interest and pursue it accordingly. 

Thank you!