should i do Ca articleship in Internal audit specialize firm?

Specialisation is the key to success nowadays. My advice to you is go ahead with it, that field is rewarding. Scope of internal audit is broader when compared to statutory audit. But ensure that don't stick to 1-2 clients during your 3 years of articleship. Work on as many industries as possible. You'll know your worth once you complete CA.

Yes, Agreed with Mr Ahmed