Isca

ISCA module Plus practise manual is sure to clear.. but Module is hard to read and difficult to read.. Most of the reference book were just precise summary of module... 

/forum/how-to-study-isca-and-get-good-marks-few-guidelines--165716.asp

see if it can satisfy your confusion or not

I agree with Vivek Sir.. If u want, u can refer to some reference book while studyin d module.. bt practice manual miss mat karna... its really good.. All d best bro.. :)