Suggest me good books for sixth semester IT?

I'm doing my B.tech IT 3rd year , now on 6th sem . i confused which book to buy, although anna university have suggested foreign author for each subject , i found many times they are not up to my understanding and sometimes two or more books are suggested for each subject so i would like to know some best... show more I'm doing my B.tech IT 3rd year , now on 6th sem . i confused which book to buy, although anna university have suggested foreign author for each subject , i found many times they are not up to my understanding and sometimes two or more books are suggested for each subject so i would like to know some best books that would help me clear my subjects and websites where i can download for free if possible .
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