Where does the comma go? Before "which", you always need one. Except in this example. Non-restrictive clauses are almost always set off with commas. Freakin' commas.
|Conventions of Punctuation||Nonrestrictive and parenthetical elements|
|Product Type||SAT Writing|
|SAT||SAT Writing and Language|
|SAT Writing||Standard English Conventions|
|SAT Writing and Language||Standard English Conventions|
|Standard English Conventions||Conventions of Punctuation|
|Test Prep||SAT Writing|