19.50Especially train 2, 4, 6, 7

1, 3, and 5 are easy because they form tonic triad.

The more informative degrees often are:

2

4

6

7

Learn their pull.

For example:

7 urgently → 1.

4 often → 3.

2 may → 1 or 3.

6 often → 5.