It's good. S2 is a basic course, suitable for children aged 4-5 who have a concept of numbers within 10 and can add and subtract.

The course is divided into six parts, including other video interactive classes, quizzes, mathematics in life, I am a little teacher, study report, and Pippi's phone call.

Zebra thinking is compressed into three stages, and from the perspective of course length, the course length of zebra thinking is also longer.