<p>The engineering section requires D-clearance and consists of >90% engineers whereas the other sections anyone can register including engineers. The book and topics are the same but the professor may decide to through some engineering flavor in there to the questions. I took an engineering section even though I wasn’t an engineering major though. My friend took Crombecque for 125 and it was really easy, he provided practice tests with identical questions and different numbers than on the actual exam in addition to allowing you to bring in a sheet of notes to use. However, I’m not sure he will have that same policy for 226 as it is a higher level class per say but nonetheless I’ve only heard good things about him.</p>
<p>Maxmillion, you may struggle in 126 so 125 would probably be the safest best for you. You won’t ever use a calculator on exams and its taught at a higher level than any AP class in addition to more being expected of you topics wise. Also, AP AB doesn’t cover many of the 126 topics so they would be entirely new to you. If you’re up for the challenge, register for 126 however I would probably suggest 125 first in order to strengthen your fundamental skills.</p>