2002 Saturn L200 turns over but will not fire up.

What is your question?

I've done just about everything except paint it. So frustrated! Changed all 4 spark plugs, fuel filter, crankshaft sensor, and even bought a new gas cap. From my understanding, my compression is low? I think they did some test 4 different times, and said the compression was 30, 30, 30, 30 .... What do I do??? Please help me!!!