Is the time sufficient ?

yes language is easy in dinesh madhan book and if you think you dont have sufficient time then go fot dinesh madhan book only

you can also take Pratice manual of the institute

Amit Sir

First of all i need to complete the syllabus, so for that i can not straightaway do practice manual 

u have got ample time my friend........no need to worry...........infact u r doing great..............focus on core subjects more........if u finish off isca nw itself,it'll b hard to recall in may...so i suggest ,concentrate more on DT,IDT .....these two are scoring subjects...however it doent mean u sideline ISCA..u need to do equally good it that too................start off wid dinesh madan......and as the time closes in ,go for the practice module issued by ICAI..i followed the same approach and it worked for me..........DT & IDT were my priorities and i scored 82 in IDT and 55 in DT which took care of my group total...........
anyways..........do watever u feel u r comforatable in doing.........All the best........