HOW TO APPLY FOR CA EXAM

You can apply for direct entry course as well as through CPT. As you are from science background it is advisable that you through CPT format. You can refer to ICAI portal www.icai.org for more details.

Just a general question out of curosity that why are you opting for CA if you are science graduate ?

But being a science graduate you need to study details of commerce from basic 11th standard. But its good if you are thinking for CA. All the best !!