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Where should I put a determiner - after "whole"\"entire" or before? For instance:

1) I was behaving just like the[should it be cplaced?] rest of the class
2) I did so much damage that the whole my class wouldn't succeed.

Are they correct? Thanks
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"the rest" in itself means the entire part remaining or the whole of the remaining amount or number. There is no need to add "whole" or "entire".

I was behaving just like the rest of the class.

Come to think of it, I believe "all" could be used, though, quite nicely:

I was behaving just like all the rest of the class.

As for the second sentence, two determiners (the, my) for the same noun (class) won't work.
It's either "my whole class" or "the whole class" but not anything with both "my" and "the".
The sentence suffers in other ways, too. You're mixing a structure for "so much X that Y" with a structure for "X so that Y". You probably meant one of the other of the following:

I did so much damage that the whole class failed / that no one in the whole class succeeded.
I did damage so that the whole class would fail. / that no one in the whole class would succeed.

I suspect you meant the first of the two.

CJ
Comments  
it should be before.

that is, the whole... or the entire...
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 CalifJim's reply was promoted to an answer.
Hi, CJ and thanks. I meant if the "the" should have been placed there, not whole.
As I can see it should have.

Concerning the second - you are right, the first of two your sentences is what I meant.
I can't understand now why I used "would" either...LOL.