Circular Motion..? Rational Function..? Orbital..? WHAT?!

Lets start with circular motion first.
Definition: a motion of a particle around a circle or circular are in constant speed, but different velocity, and has acceleration.THen here come the headache! ∆v/v=v∆t/r, then why suddenly a=∆v/∆t=v^2/r? What the hell is going on? Circular motion is running circle in my head! Today the replacement lecturer is just teaching for the sake of completing her working hours. Just get a laser pointer, point to the slide and read it out loud to us, press next for the next slide, and read it again, and again, and again until 1.00 o'clock. And me, sitting in my place, surrounded by so many question mark, scratching my head until she let us go.

Now, rational function.
I don't even know anything about it! Loser! Suddenly a bunch of mathematical rules and definitions jump out of nowhere. I can't cope. Too many new things to be program in a small brain! By the time i started to understand about long division, factor theorem, synthetic method, domain and the stupid graph, another new information is rushing in my brain, making it jammed. As the slow brain is moving slower, you should know what is gonna happen next.

And then, here comes the most confusing topic! Orbital and quantum number!
p,s,d,f...then n,l,Ml,M...Principal Quantum number, Azimuthal quantum number,magnetic quantum number, spin quantum number..then the orientation, the spin..the structure of the periodic table..oh my GOD! One simple atom can bring so many trouble into my studies! Plus the energy of emission and absorption, the wavelength, what is that all about? I going nuts! I really need a break!

Somebody save me!!!