'I second this. This is the FASTEST way to input information into a computer. Check with your school, sometimes there are license servers that you can hook up to.
It takes maybe a week and you learn all of the "esc-s-esc" (sigma), "esc-int-esc" (Integral), ctrl-6 does superscript, ctrl-5 or 7 I don't remember does underscore, etc. All of it is immediately visible so you never make syntax errors and you never have to take your hands off of the keyboard. You also can do the computations real time and correct all of your prof's mistakes.