Hello,

Yes you can go for both btech and CA. But as a BCA student I'll suggest go for MBA, MCA. Because you have already a bachelor degree so go for master's it will be upgrad your CV as well as marketing demand also high for you. But if you want to go for BTech then take admission those college who gives you lateral entry in BTech. And for CA Preparation it will be hard for you as a BCA student. But you can try.

All the best.