Suggest good compact reference book for isca

For Self Study Manish Valecha is recommended. 

How to prepare ISCA - Suggestions from CA Final AIR 1st Rank Holder - See the Attachment
 

You can refer the book "Secret to crack isca" by CA Sudeep Mangla.

It is one of the best book for self study. It consist of full Coverage of the ICAI study material, Wide range of diagrams & Charts. Lengthy topics have been very well summarised and Simplified explanation to headings. 
Best for last day study. You can check from this link:  https://bit.ly/2rs51qQ