REFERENCE BOOKS FOR CS EXECUTIVE GR-2

Hello everyone can anyone provide me CS executive group 2 good reference books for conceptual understanding. there are books available in the market for all 3 subjects of 2nd group by sangeet kedia sir. are they reliable? is there is anyone who had referred sangeet kedia sir notes for group 2 pls tell whether they are good or not or deepak gajrani sir notes are better ???