First of all, we should remember the basic equations, especially y=ax in the mathematical parabola. +bx+c You need to know what A, B and C stand for, and the equation of symmetry axis is fixed. Just memorize it.

What about the chemical atomic structure? If you give a graph, you must remember the number of nuclear charges in the circle, that is, the number of nuclear charges = the number of electrons outside the nucleus = the number of protons (it is good to know the number of protons, there will be no special graph). Isn't there a number in the middle of some vertical lines outside the circle, that is, an electron (that is, it is stipulated to be negative)? In this case, if you consider a negative electron, the rest are positively charged.

Come on, don't be discouraged, because you don't know how difficult high school is. The foundation of junior high school is very important. Be patient. Don't try to tear the book if you can't do the problem. Take your time and ask someone else.