B-MAT(ビーマット) | ２つの「考える」で学力センスを鍛えるためのシステムです。

The cutting, together with the "Dice Move" and "Drilling", represents one of the important items that serve as the key to develop high-level spatial perception.
Since the cutting is the item with high difficulty level, you should put it off and take other item until your spatial perception will have been developed to a certain level, after which you may work on the cutting.

As stated in the "Dice Move", clear the way at least until the silver stage of the "Dice Move" before you start to take the cutting.
If you really don’t improve with the cutting training within your computer screen, then just, as in other training, repeat the following sequence:
With actual thing => in your head => with actual thing => in your head
However, since it is difficult to prepare the actual thing for the cutting, as in the case of "Drilling", draw a figure so as to substitute it for the actual thing.
As for the figure, the imaging may be easier if you draw the figure that is broken up according to tier while considering which cube has been cut off. (Make note that this figure, while generally instructed as a technique of solving the problem, is only used as the substitute for the actual thing since the purpose is to acquire the ability of high-level spatial perception. No drawing of figure, therefore, is allowed during proficiency test.

Spatial perception