<p>My son is in Grade 9, he selcet Algebra II for his mathmatics lesson. His grade is A, he think the exercise for math after class is not enough. Anybody can recommend some exercise books or course?
Thanks!</p>
<p>Try the art of problem solving books at the AOPS website. He will likely enjoy all the introductory and intermediate books.</p>
<p>I had my son use khan academy . org for his pre-calc, since his teacher was not that inspiring this year. You can find practices or watch a video on a specific lesson or topic.</p>