I signed up for Machine Design, but after I started studying I realized that I have to be more comfortable with a lot more material in order to take the PM session of Machine Design. If I just do the thermo/fluids, I can just study those areas and save a lot of time. The bad thing is I dont particularly like Thermo and I do enjoy Machine Design. I'd say I'm good as good with Heat Xfer and Fluids as I am with Machine Design, but not as great on Thermo. I still have a few weeks to change my mind, any thoughts from past takers out there?