Assessment

American Association For The Advancement of Science (Free but not open source)

Online and printable test banks that can be used free of charge

 

University of Maryland At College Park

PDF versions of tests are available for a wide variety of math and stat courses.  

 

Google Play English Test Apps

Here are some free apps on google play that teach/test English grammar and vocabulary

 

Google Play Math Test Apps

Here are some free apps on google play that teach/test Math

 

Google Play Chemistry Test Apps

Here are some free apps on google play that teach/test Chemistry

 

Google Play Biology Test Apps

Here are some free apps on google play that teach/test Biology

 

Google Play Physics Test Apps

Here are some free apps on google play that teach/test Physics