Anyways, can anyone link me to a good kit/parts for building some circuits? I need some practice and need some good quality pieces.
I'm a coach for Div. B.
All the parts you need are available on Amazon.
I ordered a 365-pc box of resistors by Elenco. Also a bunch of 10-inch alligator clip test leads, and $10 multimeters - I ordered five for the team of 10, reckoning that each pair of students would bring one meter. It's easier for them to use meters they are already familiar with.
I made power supplies by using a few spare power supplies, the little black cubes that plug into the wall and deliver a few volts DC and about 500 mA. I soldered on some red and black alligator clips. One exercise for the students was to analyze their power supply to determine what resistor would take the rated current, and what resistor would dissipate 1/2 watt at the rated voltage.
For our last session, before the competition, I am going to make a multiple resistor network. They will model it, determine what the voltages ought to be, and measure the voltages to determine if their calculations were correct.