This is a bottleneck. Always like this. As long as the breakthrough, these mistakes can be added. In the face of such problems, don't be impatient. Be sure to repeat the questions you misread or miscalculated. Because in the process of repetition, when you make a mistake for the first time, you will consciously slow down and look carefully for any mistakes. Do this a few times more, and you will form a subconscious mind. When you do a new topic, you will easily make mistakes. For example, if you have a square, you can notice whether the square is missing or not, so you won't make the same mistake again. So, if you misread the wrong question, you must recalculate it yourself and do it again. In the process of doing it, remind yourself where it is easy to make mistakes and form a subconscious mind.