Poor self-control, the fundamental reason is their own problems, can not arrange their own time well, there is no clear purpose.

Mainly because I don't know how to work hard. Because I have no plan, my work may not be light or heavy. Always like procrastination, it must be getting worse and worse, and there is no chance of success.

The main reason is that the learning method is not suitable for you, you can't see the effect, and you may not have the courage to persist.

In fact, the truth is clear. It depends on who can persist in their efforts, arrange their time reasonably and accumulate constantly in order to succeed.