Or did you instead mean your question for a specific school or teacher? If so, I recommend you contact them directly, either on campus when you return to school, or via phone in advance. If you don't have the school's phone number handy (and if it is located in the U.S.), you can look it up in SchoolFinder: http://www.education.com/schoolfinder/
Or were you looking for practice tests online? If so, what kind of tests (SAT? math? English? other?)? Also, you reference "my level" but don't say what level that is (junior? sophomore? senior?).
Thanks for sharing more information so the JustAsk community can make the best suggestions for you.
There's a site with tests for all high school subjects. It was designed for the Regents Exam, administered to New York high school students. But the practice tests cover subjects generally taught throughout all high schools in the US, and it might help you. Here's the link: