Yes I'll tell you. You have to go through the following 4 stages in order to pursue CA after class 12th.

1. CA-CPT( ENTRANCE EXAM FOR CA)
2. CA-IPCC(CA INTER)
3. CA-ARTICLESHIP( TRAINING PERIOD)
4. CA-FINAL

CPT exam will be conducted twice in a year in the month of June & December,last date for submitting the CPT exam form is april for june attempt and october for december attempt.

after getting qualified in the CPT exam ,he/she should register for CA-IPCC,this IPCC exams are held twice in a year i,e May & November.

The next step after CA-Ipcc is CA-Articleship under a qualified chartered accountant for a period of 3 years

criteria for joining in articleship is :

he/she should be qualified at-least Group -1 of IPCC and such person before joining articleship have to undergone ITT(Information Technology Training) and OP ( Orientation programme) .

You will be eligible to write the CA-final exam after completion of 2 1/2 years of CA-articles.

Best wishes. Thank you.