Your grades fluctuate greatly because what you have learned is not comprehensive. If you encounter what you have learned in an exam, you will generally do well in the exam if you play normally. But if you encounter knowledge that you haven't learned, you will definitely fail in the exam. So the main reason is that I haven't learned enough.
In this case, it still depends on the foundation, and it also depends on the wrong questions in each exam, whether it is a bad mentality or a bad foundation. Most of them are poor foundations, so it still takes time to break the concept of books.
In junior high school, the requirement for computing ability is generally high. All kinds of methods such as rational number need a variety of calculations, and attach great importance to the ability to answer questions. Functions and the like all use concepts and some formulas, all of which are quadrangles and the like. These all need to be tested after fully understanding the knowledge points, and after learning, they need to prepare for the senior high school entrance examination in grade three. They need to review all the knowledge they have learned and understand all the difficulties in all aspects, so they need to find out some difficulties in housing prices.
Generally speaking, the completed knowledge map can make us understand this aspect more quickly. If you want to learn well, you must be fully familiar with the application of these knowledge points. When you encounter difficulties, you can think from another angle and slowly find your own solution to the problem.
You also need to know various concepts, formulas, rules and so on. This course needs very strong consistency. If you encounter some difficulties, it may be that you have encountered difficulties at a certain point, and some knowledge needs to be discovered and solved in time, so that your score will be improved to a certain extent.
When the teacher talks about some extracurricular content, it is generally theorems, concepts and the like, which will let you know more about this knowledge. Therefore, students who have problems with such topics can read more extracurricular topics. Of course, improving grades is inseparable from exercises. If they want to get better, they need to do more exercise, but not too much. They need to think while doing so that what they have learned can be applied.