Columbia Science Honors Program Entrance Exam

Hey guys, I applied to the Columbia Science Honors Program and my test is on the 24th. I’m not the brightest student but I really want to get into this program. I’ve been looking online but there isn’t that much information on the entrance exam test. From what I found is that on the test there’s

Basic chemistry
Basic biology
Earth Science
Circuits in physics
SAT similar math questions
Challenge math section similar to AMC questions

Is the challenge math section similar to AMC 10 or 12?
I have never taken physics before, but I’ve been studying circuit physics (basic formulas, Ohm’s law, etc…) so should I be fine?
To anyone who has taken the test/got into the program before, is there anything else I need to know about the entrance exam test? What should I study the most/how did you prepare for the test?

Again, I’m not genius student–I only do well when I study really really hard. Do you think there’s a chance for a mediocre student like me, or do only valedictorians/genius math students get in?