Dear Rohan ,
As per rules of government if you failed in one subject in 10th then you can go for retest but if you have failed in more then 2 subjects then you are not eligible for retest so you have to wait for 1 more year for exam .
But NCERT(National Institute of education and Research and Training ) provides varieties of books for lots of education board like CBSE,UP board etc..
Thanks
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