What is a red self-test card?

A tool for self-testing. Red film self-test card is usually used in the field of education, especially in the field of language learning. Some English learning materials will be equipped with red self-test cards to test students' memory and understanding of words. This kind of card is usually red and can be tested by covering words or words. By shielding some contents, students' memory and understanding of words can be tested, thus consolidating knowledge in time. Red film self-test card can improve the learning effect and help students master knowledge better.