IXL.com - choose by subject or grade level - you can do up to 20 practice questions per day without a paid subscription
Prepdog.org offers tests and practice activities organized by basic, proficient, and advanced RIT levels
SuperTeacherWorksheets.com focuses mostly on skills for grades K-6, but some of these might offer good review of concepts for 7th and 8th graders.
Math Chops (fun quizzes and other games with free or subscription level accounts available)
KhanAcademy is one of the best sites for learning, practicing, and reviewing math skills. For math practice by RIT score and MAP performance area, visit khanacademy.org/mappers.
Prepdog.org - practice tests by grade level
Math Worksheets 4 Kids - use the menu on the left side of the page to choose which skill you'll practice
S.O.S. Mathematics - This award-winning site offers help in algebra, trigonometry, and calculus, including practice quizzes with complete solutions. The site also features links to other math websites that offer online help, tutoring, and other services. This is a GREAT resource.
Like Quizlet and studying with flashcards? Try Educational Endeavors' own Quizlet set for middle school math concepts
Bad at basic arithmetic? Get the practice you need with the Mental Math Trainer.
Prepdog.org - practice tests by grade level
Critical Reading Questions by Topic (appropriate for students who expect to reach advanced passages on the NWEA MAP)
Readworks.org - free content and tools for reading practice at every grade level K-12
Quizlet - EE has created flashcards sets for hundreds of vocabulary words found on the HSPT, ISEE, and SEHS exams; study flashcards directly or play games that test your word knowledge.
FreeRice.com - after you answer the first question, you can click "change level" at the bottom of the screen to work on harder words (7th graders should try levels 4-12 to start)
Vocabulary.com will test you and adjust to your level - this is a great site for learning words from their context, like you will have to do on the NWEA MAP and many high school entrance exams Recommended lists include...
Wordly Wise Workbooks - Browse here for all grades, or find your direct link below.
Confused by homophones and other frequently misspelled words? Practice with EE's Quizlet flashcard set
More suggestions coming soon!