Misfire and engine knock

I just tested but forgot to warm the engine up first. By the time I remembered that it was supposed to be warmed up first, I already had the plugs out, the fuel relay unplugged and the ignition system disabled so I just went ahead an tested anyways because the three plugs in the back are kinda hard to put in and take out. I only tested cylinders 2,4, and 6… will do the other 3 if it is necessary for a proper diagnosis.

2:210

4:210

6:120,90,15 (three seperate tests) then added three squirts of oil and got 130. Then let the pressure out of the gauge and got 25.

Piston rings?