I'd be more than happy to help, however, science is my weakest subject to teach.
I believe they are a little expensive, but Tutor Doctor hires certified teachers and Education graduates. One of my fellow teacher friends works with them(
http://tutordoctor.com/)
Another option that could work (and is quite affordable) is Westside Rec Centre in Westhills offers a tutoring program that is free with admission. I believe the hours are 3:30-6:30 Monday-Thursday, you may want to call and see when their Science specialist is in. They mainly hire University students. When I first moved back to Calgary and was seeking teaching employment I was working there for a bit tutoring the humanities and math.
I wouldn't tie myself to one individual tutor, they are all different and one tutor that might be great for one student, may be difficult to understand for another. Play the field...
What I would NOT recommend is those Diploma Prep Crash Courses. The brain does not learn that way.