This brand-new test preparation aid can be used alone or in tandem with Barron"s new AP Environmental Science manual. A set of 500 flash cards present frequently-asked questions on the AP exam with answers on the reverse side of each card. Questions cover all AP test topics. The cards measure 4 1/2" x 2 3/4" and have a punch-hole in one corner that accommodates an enclosed metal key-ring-style card holder. The ring allows students to arrange flash cards in any sequence that suits their study needs.