Here are some easy things you can do to keep your brain sharp and material fresh while you are on winter break...or having a snow day!
Review your notes, quizzes, tests. Look the the diagrams. Be able to explain the diagrams to your mom, sister, or friend.
Check out videos on youtube about a topic you're having trouble with. Can picture how DNA is replicated? There are a lot of great animations out there that can help!
Do test corrections. Why did you get the answer wrong or why is the correct answer right? This will help you remember information and understand what the questions are looking for.