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It is not possible to share links in can help u can find on net
1. lakhmir singh
2. dav books
3. ncert books

no guys i didn't fine any reader in net
Books for class 5 and 6 are
math curse
after math
grapes of math
love and maths 
the talent code
secret of mental math
the joy of x
a mind of numbers
thinking in numbers
murderous maths
and many more..........
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