Chemical engg and mettalurgical are different branches .. last year cut off metallurgical kanpur is much high ..Both are very good options .. It depends on how well u are able to understand, then u wont need to cram. and to understand, u need to simply have passion for what u are doing. so just clear ur mind and think of what u love best.
Click the link below link for opening and closing rank of old IITs :
http://www.askiitians.com/iits-2009-2010-opening-and-closing-rank.aspx Cutoff in new IITs check the link give below : http://jee.iitd.ac.in/openclose09.htm (this link includes the more detail analysis) for code of the cources check the councelling broucher 2009.
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All the best.