timeCalculate

sample Q from each layer	teach-learn questions
layer	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
practise-learn worksheets
print hints	d/s 2pp	d/s 2pp	d/s 2pp	d/s 2pp	d/s 2pp	d/s 2pp

NC information