Don't trust people upstairs. It is very difficult for mathematicians, especially now that mathematics is widely classified, and it is very good to make great achievements in one branch. The important thing in mathematics is thinking. You should understand the history of mathematics and see how mathematics has come to this day step by step. See how some important problems are solved, such as Fermat's last theorem. This can be done without effort. It requires thinking, but thinking, as you know, is like looking at flowers in the fog.

So now, you should study with peace of mind, reflect after each exam, think and think about logic. Because you have more than 130. The foundation must be very good. What is needed is a breakthrough in the bottleneck, which is hard to say. As for calculus, this high number is too general, because it is impossible to tell you how many years. It takes hundreds of years to form a system after studying for one semester. Do you think you can learn it well if you want to learn it in one semester? Take a brief look at the history of mathematics and think about why it appeared. I think it is more useful than mastering it. Because you are still young, you still have the opportunity and time.

As for the game, you should relax. Confidence is very important. Your grades mean nothing. You did well in the exam. It's no use. Computers are better than anyone now. Again, thought is very important, and thought cannot be tested. Thought depends on mastery, not just mathematics. I wish you success.