Optimise (Levels A2 & B1 updated) Ideal for: Secondary teachers seeking friendly material to successfully prepare 21st century learners for international exams through a wealth of printed as well as digital materials. Optimise is a four-level series for teenage students who will sit an external exam. It helps students understand how certain exam tasks are designed, what they are testing, and how to ensure they get the best possible marks as well as improving their overall language level. Levels A2 and B1 have been updated to follow the 2020 Cambridge Exams.