Which is the best book to practice math from which includes theory also?

cengage series is best ever
because it has lots of  theory portion  good level  of solved examples  nd mainy of mcqs with  solution at  last of the boof   
this book   is the  best   weapon for jee to  self study
ok
so best of luck for ur exams   
do studies hard  
and give ur best   
i hope for ur good
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I think for maths R D Sharma is the best book It includes theory and also solved examples and it has difficult problems also