What are the techniques to get over the learning plateau?
Increased spacing between learning sessions has been found to improve long-term learning when studying for tests. The key is to study less per session, but more often. To develop a habit, you could start by connecting your time of study to a habit that you have already established. For example, if you always brush your teeth, you could associate putting the toot-brush back with walking over to your study area and opening a book.

Repeated learning further enables learning. This is one of the reasons spaced learning works. Once you have studied a chapter the previous session, you go back to the same chapter, skim it, and think about the concepts that you have learned. Repetition is key to rote learning.

Facing the hard parts requires a very thorough understanding of the basics. Know the basics. Don't be afraid of your brain working harder on some problems. The more advanced stuff will take more time to learn. That is the natural course.

TLDR:


No.
A lack of repetition, spacing, and knowledge of the fundamentals.
See above.