It's no use reading geometry in grade three. The meaning of geometric elements can not be fully understood at the level of grade three, and it is not very helpful to do math problems in junior high school. The construction system of geometric elements is very interesting and enlightening for the study of mathematical axiom system. Moreover, when you have studied non-Euclidean geometry, you will find many details that you would not notice when reading the original work. This is why we need this theorem, why we should prove these theorems first, and then prove other theorems. Which theorems play a special role under what circumstances? These are incomprehensible at the level of junior high school students.

So the conclusion is, don't read such great works as the Elements of Geometry.

Then, back to the key question, how to improve the ability to solve geometric problems.

My experience is to solve geometry problems by feeling. After adding some auxiliary lines, I got some new relationships. Whether these auxiliary lines are useful or not depends entirely on the feeling.

At that time, I liked solving geometry problems best, so I did a lot of exercises and felt very accurate. There is a very interesting problem in geometry, which is called lattice problem (a point in a triangle is connected with three fixed points, and three internal angles are divided into six angles). If these angles are all integer degrees, this point is called a lattice point. It is particularly interesting to see how the geometric problem of lattice points is proved.

Therefore, if you want to improve your geometric ability in a short time, you must do three things.

1) Try to draw a standard drawing for each question, write the process on a new A4 paper for each question, and write only one question, only one side, and save it after writing. You can classify it or not, but keep it for easy reading. Classification can be based on simple, plane geometry (straight line, triangle, quadrangle, circle), solid geometry, analytic geometry (straight line, parabola, ellipse, hyperbola).

Don't be afraid to waste paper. There are 500 A4 sheets in a stack. You have finished writing a stack with 500 lines. After writing more than 300 pages, I have a good impression.

2) Do more questions. Considering your level, it is estimated that math is not very good, otherwise you don't know how to ask questions in class. It may be a bit procrastinating, and it is not until the third grade that I can understand such interesting mathematical knowledge as geometry. Therefore, I recommend you to be the Huanggang question bank, or the second book of the third grade of the Olympic Games (Yellow).

If you want to see a little more difficult and interesting geometry, I recommend the Plane Geometry Test in the Latest World Mathematical Olympiad edited by Liu Peijie. It's a thick dictionary, which is very interesting and has all the answers. It completely exceeds the difficulty of the senior high school entrance examination.

The more advanced books are Shen Wenxuan's "The Complete Book of Proof Methods of Plane Geometry" and "The Complete Book of Proof Methods of Plane Geometry". These two books are very accurate in high school mathematics competitions, which are difficult for students to understand.

The most difficult and best-looking geometry book I have ever read is "Orsay Classic Special Research Series-Senior High School Mathematical Geometry Problems". I don't suggest you read it now, but since you are interested in reading the original geometry, I will recommend some good books to you. This book is completely worth pondering.

3) When you do the problem to a certain extent and feel good about yourself, you can start to exercise your brain capacity. Look at the questions directly, don't know the pen, add auxiliary lines in your mind, and then complete the main steps. This is very difficult. If there are more than three auxiliary lines, it will be chaotic. This exercise is time-consuming. For you who are preparing for the senior high school entrance examination, this method can be used in the future, but it is not suitable at present. Only after doing a lot of exercises on paper can it be effective to read the topic without writing it.

When the brain gets bigger, everything becomes much easier.