Purple Comet 

Purple Comet Math Meet 

https://purplecomet.org/

ASMA 

American Scholastic Mathematics Asshttp://www.asan.com/asma1.htm 

https://www.asan.com/home

CML 

Continental Mathematics League competitions 

https://www.cmleague.com/product-category/cml/ 

MATH Olympiad 

http://www.moems.org/ 

The CENTER for EDUCATION in MATHEMATICS and COMPUTING 

http://www.cemc.uwaterloo.ca/contests/contests.html 

Middle School Science Bowl 

Department of Energy ( DOE) Science Bowl competition

https://science.osti.gov/wdts/nsb

https://science.osti.gov/wdts/nsb/Regional-Competitions/Resources/MS-Sample-Questions

USACO 

USA Computing Olympiad is a computer programming competition 

http://www.usaco.org/ 

http://www.usaco.org/index.php?page=resources