Khan Academy
Khan Academy: Storing Data in Variables
Practice variable assignment in the AP CSP pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.
Khan Academy
Khan Academy: Storing Strings in Variables
Practice storing strings in computer programs, in this set of free practice questions designed for AP Computer Science Principles students.
McGraw Hill
Glencoe Biology: Methods of Science: Self Check Quiz
Take this self-checking, five question practice quiz over various methods of science.
United Nations
Unesco: Algebra Review (In Arabic)
This page, part of a larger UNESCO site on math and science education, has 15 basic, open- and multiple-choice algebra questions, with the correct answer immediately following the question. Entirely in Arabic.