What should I do after completing class 12th with commerce stream to get the best placements and to pursue CA?

If you want to do CA then apply for CPT and clear your CPT and while doing CA, you can do B.Com form any college. If you are doing external .Com, it will help you for doing CA.

For best placement, complete your B.Com and do an MBA. If you are interested in CA also, first prepare for CPT and then do prepare for IPCC along with B.Com But, if you decide to do CA, you need to be more hard-woking and have lot of patience. Or, do an MBA in a reputed college after B.Com. All the