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Varsity Learning Tools provides more than 60,000 individual problems and thousands of practice tests across 150 subjects. This includes subjects like foreign languages, history, math, and science at all levels of sophistication. We also have practice tests and problems for common standardized tests like the ACT, SAT, GRE, GMAT, LSAT, MCAT, ISEE, and SSAT. To date, students have completed more than 30 million problems on the Varsity Learning Tools platform. Each question is tied to a specific academic concept, which means that students can pinpoint their particular strengths and weaknesses in almost any area.

Information: http://www.varsitytutors.com/classroom-assessment

Also, the Varsity Learning Tools platform includes free digital classroom assessment software that teachers may find useful.

Student website: http://www.varsitytutors.com/practice-tests