Pattabhiram is good both for concepts and problems but if you want further practice then go for A.N.Sridhar's Problem & Solution but make sure you have to read Pattabiram for Concepts, its the excellent book.
It is your choice..better to have both! work on ANS for problems and Pattabhi for theory and concepts..What I follow is Pattabhi and I have the compilation along with the book, which is more than sufficient