Websites:
KhanAcademy.org for online courses, lessons and practice
Books (our recommendations):
Singapore Math Books -
Beast Academy Math Book Curriculum (BeastAcademy.com/books) - for advanced students
Creative Problem Solving in School Mathematics 2nd Edition by George Lenchner
Websites:
www.AoPS.com -- - books and courses for advanced elementary / middle school students
VLACS.org math course offerings - courses for advanced middle school students
KhanAcademy.org for online courses, lessons and practice
Books (our recommendations):
Preparing for the AMC 8 competition:
https://artofproblemsolving.com/wiki/index.php/AMC_8_Problems_and_Solutions
We also have some AMC 8, 10, and 12 series on our YouTube channel!
Preparing for the AMC 10 competition:
https://artofproblemsolving.com/wiki/index.php/AMC_10_Problems_and_Solutions
We also have some AMC 8, 10, and 12 series on our YouTube channel!
Preparing for MathCounts: