LearningExpress Library (LEL) is a test-prep and skill-building database available to all Oregonians. The K-12 access point is via the Find Information page on OSLIS (elementary, secondary), or via the Oregon Career Information System for schools that subscribe to it. Different centers within LEL cover different topics. The School Center offers upper elementary, middle school, and high school Common Core-aligned math skills practice and explanations on topics ranging from number and operations to geometry and functions to statistics and probability. If students use Practice mode, they can see answer explanations after they are finished with the entire test.