I'm looking for a source of harder mechanics problems, preferably with solutions. I'm supposed to use the Young and Freedman book, but I find it rather teadious and superficial; most problems don't match the difficulty and depth of the ones on the exam. I had my mid-term tests recently, and got startled seeing my dynamics score (63%), though math and relativity was a breeze (100% each), so I know that it isn't the math that hinders my progress. I study in the UK if that's relevant. Thank you.