Hi,
Yes you can go for mca if you want.  The basic eligibility is that candidate must have mathematics as a subject in their 10+2 or in graduation.
But it will be very difficult for you as bca makes a base for mca and mca is a very professional and technical course. You should have good knowledge about topics like softwares , databases , browsing , ms office , etc.  which is taught to students in detail in their bca degree.
So it will be better if you go first for bca then for mca .
Hope it helps...