Reference book for Costing & QT and ISCA

ya i m also facing d same problem..i took coaching frm Sanjay Aggarwal sir...but i m not satisfied with his coverage...i had seen Saxena & vashisht...but i think it's not according to our syllabus ...it includes some Pcc level topics n some wat diificult ones that r suitable only for ICWAI xams..n regarding ISCA even Diensh mdan's buk had prooved insufficient...the only alternative is following module.but the language is too tough for Layman like us

Costing, QT- Go for Paduka or Parag Gupta (but problem with Parag Gupta is that its solutions are a copy of classwork notes of any of his students, but coverage to New Course is marvellous & far better than any other book in market).

ISCA- Dinesh Madan is best rather a superb book