preparation from only practice manual

NO WAYS !!!!!!! NOT ENOUGH. Short cuts only end up prolonging your CA Career. Beware.

Strictly No.

Must read a textbook  ( or Module for Law and ISCA ) at least once before switching to practice manual for revision and exam day study for all the three.

Assuming FIRST attempt ... and only Practice Manual....  Big Mistake .

But to be honest...theres no rule as such. Try at your own risk.

We dont deal in certainty ...only probability in these exams.

You MAY clear. Probability - Below Half.

Good Luck !!