Rigorous Enough Courseload?

<p>Hello everyone. I am currently taking AP Calc AB, AP Spanish, AP Statistics and AP Psychology, as well as regular World Government and International Relations (we don't have honors classes), and two teacher assistant classes in different literature subjects. Is this a rigorous enough course load for a place like Harvard? I have the option of adding AP European History, but I'm worried it might be an overload. Will it make a difference to add this fifth course or does it not matter too much in admissions? Any input is much appreciated!</p>