Where can i find some websites for physics help?

my teacher gave my cl a few ignments of things we learned last year so we could review for the AP test. Two of the ignments are Temp/heat/thermo and Nuclear/atomic which we never covered last year. The questions on the ignments come straight from the Giancoli Physics book but they are hard to read and understand. I need to know if there are any websites where this information can be found