In the morning of early winter, the branches with leaves falling, a thick layer of white frost condensed. After the morning mist dissipated, the warm sunlight shone on the back mountain of the campus, presenting a white and quiet beauty.

Our course has been completed, and the final graduation exam is about to be held. The school will leave a week to allow the students to review freely. Because it involves the issue of recognizing diplomas, this exam is relatively strict and everyone is involuntarily nervous. In order to concentrate on reviewing and preparing for the exam, those students no longer go home every day.

As soon as the sky was dawn, I went to the back mountain to read books. The reason why I didn’t go to the warm classroom was that there were too many people there and it was difficult to calm down. Second, I felt that when I was outdoors, people’s minds were clearer, which was easy to think and remember. After I memorized all the formulas and theorems in the two courses, "Electrician Basics" and "Factory Power Supply", it was breakfast time.

I walked down the mountain with my textbooks. When I passed by the mysterious iron gate, I thought of the luxury of my master here a few months ago. My heart couldn't help but feel sighing. Time flies so fast that I'm going to say goodbye in the blink of an eye. In the past six months, I seem to have adapted to everything here, and it can even be said that I fell in love with this simple study life. But such days are about to end, and I want to return to my original life, and I can't help but feel reluctance and nostalgia.

When I was almost at the foot of the mountain, I saw a tall maple tree standing under a beautiful figure. When I walked closer, I recognized it. It was Yuan Yuan who was following the trunk and leisurely reading a foreign novel.

"The exam is coming soon. You get up early in the morning and have the leisure to read novels." I know that Yuan Yuan's grades are among the best in our class, and every exam is relaxed and comfortable for her.

"I'm tired of reading books and want to change my mind." Yuan Yuan's big eyes were filled with surprise, and he patted the schoolbag hanging on the tree fork. In the open zippered schoolbag, there were indeed several professional textbooks.

"If I have two-thirds of your ability, I will definitely work hard to get into a university." I envied Yuan Yuan from the bottom of my heart. I gritted my teeth and followed the courses I studied.

"You - as long as you study so seriously, you will definitely be admitted to university." A playful smile appeared on Yuan Yuanqingli's face.

"I'd like to lend you a good word, it seems... I really have to study hard." Yuan Yuan's affirmation made me very happy, but it was a bit out of reach for me to take the college entrance exam.

"Breakfast has begun, let's go down to have a meal." I suggested softly.

"Okay, let's go." Yuan Yuan put the novel into his schoolbag, zipped it up, and carried it behind him.

Yuan Yuan’s backpack is small and exquisite, very beautiful. It was rare in the past and was mostly imported. Her life and taste are beyond our reach.

"When the exam is over, I will return the junior high school textbook to you." I said as I walked.

"Have you finished reading it?" The little girl flashed her long eyelashes and glanced at me.

"I read it for half of it, and I understood it in a hurry." I looked ahead and said the truth.

"Then I'll give it to you, I hope you can finish reading it." Yuan Yuan caught up with my pace.

"Thank you, I... will definitely try to finish reading it." I said stutteringly.

After leaving the master's house that time, I began to deliberately alienate Yuan Yuan, no longer play and chat like before, and tried to make each other's communication become respectful and polite, because I clearly realized that the ambiguous situation between me and Yuan Yuan must be over. Yuan Yuan didn't know why I suddenly changed. She had tried to spread the matter with me many times, but I refused to communicate for various reasons. The two people who were together day and night were separated by a mountain in their hearts, which made each other very painful. Although Yuan Yuan felt resentful, he was still peaceful and peaceful on the surface, and showed good education, which made me admire him from the bottom of my heart.

"How are you reviewing?" Yuan Yuan asked with concern when he saw me silent.

"A large part of "Mathematics" is high school content. I haven't finished reading algebra in junior high school, so I don't master it very well. Are the other professional courses still sloppy." I couldn't help but feel nervous when I thought of the upcoming exams.

"The question for our exam this time is to ask the Teaching and Research Department of the Municipal Education Bureau to give you some key tutoring." Yuan Yuan stopped and pulled me.

"This...this is great." I looked at the girl in front of me, and my heart was filled with gratitude.

The red sun rose, and the morning glow dyed the eastern sky red. When we returned to school, some classmates had already come out after dinner, so we hurried towards the cafeteria.

No matter how you prepare, the exam day has come. Because I have been reviewing quickly, I did a good job in the professional courses in the previous two days. The last day was "Introduction to Economics" in the morning, and it was not difficult to pass rote memorization. After the exam was done sloppy, there was only the last "Mathematics" in the afternoon.

After lunch, I went to class to read books. I was too slow to sharpen my guns in the face of the battle. Last night, Yuan Yuan brought me to the home of a teacher named Wang. Mr. Wang was a colleague of Yuan Yuan's mother. After graduating from university in the 1950s, he came to support our Huaibei region from southern Jiangsu. Although Yuan Yuan did not say it clearly, I could feel that Mr. Wang should have participated in the question setting this time. Mr. Wang is indeed an experienced old teacher, and his level is much higher than that of our country teachers. He did not explain specific questions to me, but instead brought the "Mathematics" textbook we learned and carefully sorted out all the concepts and theorems, which gave me a feeling of clearing the sky.

After leaving Teacher Wang's house, I rode my bike with Yuan Yuan, and couldn't stop praising in the cold wind: "When I was in school, if Teacher Wang came to teach me, the mathematics class would be awesome. There was no college student in my country junior high school. The principal Wei Yanjing had the highest education, and he graduated from a middle school teacher and still taught Chinese."

"The city is so good, don't you want to stay?" Yuan Yuan murmured behind me.

When I heard the girl's resentful voice, my heart sank. I was afraid that I would stimulate her again if I accidentally stopped. So I quickly shut up. In the following time, we didn't say anything. It was not until the school parted before I said thank you with guilt.

The last exam was held on time at two o'clock, and the classroom became nervous. When I got the paper, I saw that the fill-in-the-blank questions and judgment questions in the previous ones were concept filling and theorem application. These questions seemed to be not difficult, but as long as the concept was a little blurred, it was very easy to make mistakes. Fortunately, Teacher Wang sorted it out for me last night, and now his thinking is clearer. I worked it smoothly all the way until the last two big questions that made me stumped.

I raised my head and glanced at Yuan Yuan on the table next to me. I saw that she was writing hard, and it seemed that she was doing the final sprint. I had no idea for a moment, so I calculated my own score. The last two major questions accounted for 15 points each. Even if the questions above were all correct, the highest score could be reached 70 points. If one or two questions were wrong, they might fail. Therefore, for the last two major questions, one question needs to be done in any case to ensure that the math was finally passed. I analyzed it carefully and found that the algebra question was too difficult, so I focused my attention on another three-dimensional geometry. I had a good sense of space. I had finished self-taught plane geometry in junior high school. The theorem methods of the two were basically the same, so I decided to prove it.

Time passed by minute by minute. I was drawing sketches over and over on the straw paper. Someone had handed over the paper. I glanced at Yuan Yuan, and she had already put down her pen and was looking at me foolishly. Seeing my eyes swept over, Yuan Yuan gave me an encouragement smile. I wiped the sweat from my forehead, pointed to the questions on the test paper, and waved my fist firmly. Yuan Yuan understood what I meant, and suddenly drew a corner in the air, pointed to his right hand, and waved his fist. Just as she swung her fist, I had a sense of shock. I quickly buried my head, followed the idea provided by Yuan Yuan, and proved from the lower right corner of the tetrahedron, and finally proved that the tetrahedron was the same size as the inner cylinder.

The moment I put my pen down, the ringtone for the final exam rang. I shook forward and handed the test paper to the podium. Someone patted my arm and I turned my face to the side and saw Yuan Yuan's clear and bright pupils staring at him steadily.
Chapter completed!