Is cengage is Best Books for JEE preparation ?

what are best books for doing problems?

Cengage contains good quality questions but the solutions they give in solved examples  are not up to the mark,.

for physics its good but lacks in chemistry. 

@ vemulath 
yes , cengage are best choice for maths , but for other subject , donot foloow that . 
i am giving some recommendation for jee books below 
chemistry 
1- physical by p . bahadur 
2- inorganic by grb publication 
3- organic by morrision and boyd ., 
physics 
1- concept of phy by h c verma 
2- problems in gen phy by i e irodov 
3- university physics ( optional ) 
maths 
1- cengage material 
2-maths by m l khanna 
3- obj maths by r d sharma 
but dnt follow more than 1 books except ncert , that will make confusion . 
and for doing prob . ml khanna in maths and hcv in phy are more than enough to clear jee.. 
ALL THE BEST ..