Let's revisit the description of your oven.
You are aware that you don't need the broil option when baking, right?
Just light the bottom and stick an oven thermometer in there.
Most cookies are baked at 350 degrees.
Adjust the heat up or down to maintain your recipe's suggested temp with what is showing on the thermometer.
So light the bottom burner, preheat to your desired temp by turning burner up or down, stuff the pan in and don't open the door again until the proper amt of time has passed.
Keep a close eye on the clock until you and your oven become friends and you learn the exact time to check/pull the product.
Why have you not talked with your pastry instructor about your problem.
Maybe he/she will come 'round and have a look.
# stop wasting ingredients...if your money is burning a hole in your pocket go donate it to a charity of your choice.