Our CLEP test preps are perfect for adults returning to college (or attending for the first time), military service members, high-school graduates looking to earn college credit, or home-schooled students with knowledge that can translate into college credit. /REA's review covers all the topics found on the official CLEP Principles of Marketing exam: marketing research, target markets, distribution, promotional strategy, and more. /Students start their study by taking our diagnostic practice test online. This timed test ...