You can find the PSAT/SAT material from any page by following these instructions:
1) From the top menu bar click on "Subjects".
2) Go down to "Test prep"
From here you can choose the (3) Current SAT (through January 2016) or (4) New SAT (starting March 2016). Note: If you are studying for the PSAT, you would select the New SAT since the change for the PSAT is sooner than for the SAT.
The material is the same for the SAT and the PSAT, giving students studying for the PSAT a bit more material than absolutely necessary.