Which book is the best for mathematics at advance level...Should I use Advance problems in mathematics by balaji publications or the ,cengage series of books,

It all depends on you, if you are at starter level then you should go with cengage series because they have tons of examples, which will crystal clear your concepts, they also give solutions to all their problems which will be beneficial and time efficient. Their DPP’s are also good and are set as respect to different concepts. After doing it you can for SL Loney and Hall and Knight.