hello dear

the best book for integration for the beginner is :

go for RS agrawal to build up the concepts and than go for RD sharma

after doin these books go for

ML khanna and than go for AD gupta to make grip over a topic

 for integration do only first few examples and exercises from rd so that u know wat integration actually is?

then go for ML Khanna( now it would be a bit easier ) finally go for TMH or AD gupta

U wanna d book 2 class 12th level or engg level, coz nw u r in engg college???????