MATHCOUNTS website resources
https://www.mathcounts.org/programs/competition-series/past-competitions
https://www.mathcounts.org/resources/school-handbook
https://www.mathcounts.org/resources/oplet
https://www.mathcounts.org/resources/problem-of-the-week
https://www.mathcounts.org/student-resources
AOPS website resources
https://artofproblemsolving.com/mathcounts_trainer
https://artofproblemsolving.com/alcumus
https://artofproblemsolving.com/ftw/tos.php
AMC-8 Links
https://artofproblemsolving.com/wiki/index.php/AMC_8_Problems_and_Solutions
AMC-10 Links
https://artofproblemsolving.com/wiki/index.php/AMC_10_Problems_and_Solutions
MATHCOUNTS National competition videos
https://www.mathcounts.org/programs/competition-series/competition-videos
KHAN ACADEMY Links
http://www.khanacademy.org/#algebra
http://www.khanacademy.org/#california-standards-test-algebra-i
http://www.khanacademy.org/#california-standards-test-geometry
http://www.khanacademy.org/#ck12org-algebra-1-examples
http://www.khanacademy.org/#california-standards-test-algebra-ii
http://www.khanacademy.org/#algebra-i-worked-examples
http://www.khanacademy.org/#geometry
http://www.khanacademy.org/#trigonometry
http://www.khanacademy.org/#probability