Dear Adi Sam,
Yes. Cengage Mathematics books are good for IIT-JEE preparation.
I have tried these books and the quality & quantity of the problems are good but I would like you to go for Arihant if you want to choose between the two of them because Arihant has been in this coaching students for quite a long time and I would recommend you to be with the best !!
Hope this information helped you immensely..
All the very Best & Good luck to you ..
Godfrey Classic Prince
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