Pls remember its CA-Final exam of ICAI (2nd largest A/c body of world) .
They need to maintain their standard.
As Rightly said by CA Amith Lath expect some surprises not only in exam but also in our results also.
Our exam standard are so much high that no 1 text bk on AS/other sub is sufficient for exam preparatiion nor we have time to refer 2/3 diffrent authors textbk on 1 sub. It is not posiible to cover whole sylaabus with all permutaion n combination of sums on same topic due to limitaion of time.
The only solution which i think is go thoroughly wit 1 bk n just refer other bks ( if time permits),Study material & other sources if ICAI as much possible quickly as n we do topics from main bk.