Choose the first level in the game (sorry can not remember name) the one straight AFTER the prologue. When you get to the part in which you must open the hangar door using force to continue, instead of opening the door, pick up the unlimited energy sith holocron and go nuts with force lighting, you should kill about 40 enemies by the time they stop spawning. Here is the important part, >>LEAVE A FEW ENEMIES ALIVE<< once you have killed most of the enemies let the remaining few kill you, you will be taken back to the last checkpoint and you points will have stayed the same, repeat the process until you get to 600,000, you get 20-30 thousand points every time using the process so it shouldn't take you to long.