There are some information on catalogue:-
1) Basic Thinking Math Level 1-23, each level has 18 sets;
Level 24-32, each level has 16 sets.
2) Critical Thinking Math, 1-23, each level has 12 sets,
Level 24-32, each level has 8 sets.
that is we don't know how may books of one sets?
right ?
我問了enopi workshop - Mr. Cheung, he said that
Basic thinking math - One Level has 18 sets,
e.g. Level 5 1-18, it is the whole level
Critical Thinking math - One Level has 12 sets.
e.g. Level 5 19-30, it is the whole level