So far I've been focusing on getting you to use some very basic commands to run the Arduino. Listed below are those commands that you must know by now. If you don't or aren't sure how to use them then you must spend some time working on them. If you need more reference than the lessons on our site then you should download Getting Started with Arduino and the Arduino Programming Reference. Both of these can be found on our Electronic Bookshelf.
Here are commands that you should be able to define and know how to use:
setup
loop
int
pinMode
digitalWrite
delay
for
digitalRead
if and if/else
analogWrite
analogRead
map
variable=!variable
Serial.begin
Serial.print
Serial.println
Should know by now for B/C
everything above, but focus on specifics of use
array
servo