Kid's Box 5 Language Portfolio Karen Elliott Kid's Box is a six-level course for young learners. Bursting with bright ideas to inspire both teachers and students, Kid's Box gives children a confident start to learning English. It also fully covers the syllabus for the Cambridge Young Learners English (YLE) tests. This Language Portfolio fully complies with CEF guidelines, and allows students to monitor their own progress. Level 5 begins the Flyers cycle (CEF level A2).