Which Website is relevant to Grammar exercises ?
If you mean for purposes of English learning, try
http://owl.english.purdue.edu/
It has a little of everything.
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I'm going to assume you are referring to English grammar in this question. You can check out two websites (pasted below) that I've always found helpful. (Both offer free online tutorials that can be very educational.)
www.edufind.com/english/grammar/index.cfm
englishgrammar101.com
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