You can contact me for gentle, expert preparation for any of the following exams:
I can also help you prepare for math placement exams.
Khan Academy has a great Algebra series. For middle school school students preparing for the summer Algebra exam for Evanston Township High School, I recommend the following series:
Systems of Linear Equations
This is another cool site that can help you with ratio word problems
Be sure to use the "Practice this concept" button whenever it appears on a page. Another way to practice is to pause the video and work out the answer on your own before seeing how Salman Khan solves the problem.