Lookup and Pull Results into new Sheet

I am having some difficulties and was hoping someone may be able to help.
What I am trying to find a function that will scan down a column to find a particular criteria. I would like all the cells that meet this criteria to have their entire row pulled through to a new sheet.
For Example, In the attached spreadsheet, I would like everyone in sheet 1 to have their details pulled through to sheet 2 if they are in class 1, sheet 3 if they are in class 2, and sheet 4 if they are in class 3.

Thanks