advise please

Sreenivas reddy (student) (39 Points)

06 January 2008  
I have completed my +2 and i will be writing my cpt exam in feb
I want to do my articleship in one of the big4.
i want to know whether i will be able to get into any of the big4.
Is there any minimum marks that i should get in cpt to get into any of the big4.If so what is it?
I am from cbse background and i have an aggregate of 94.4 in my +2 exam.Will this work in my favour to get into the big4.
Is it good to do my articleship in any of the big4.