As you want to get the details of CA after 12th (Science) so here is the information of the same for you:

After 12th (science), one can definitely apply for CA course. Being a 12th class candidate you need to register and apply for the CPT foundation exam.

In this level, you will be tested in basic concepts in accounting, mercantile laws, language skills etc.

Try to qualify in CPT exam so as to join for IPCC. Another option is that, graduates can even directly join IPCC without CPT. In such cases, they should score 60% marks in graduation level.

This level also includes certain practical programs too. Article ship training is included in this level.

Apart from this, you need to attend ITT training for 100 hours so as to attend final CA course.