well you didnt say what day I so I assume you wanted
a saturday
you can take Metrolink to newhall then board
(departs Palmdale metrolink at 9:50am arrives Newhall at 10:52
then you can board Santa clairta transit lines 1, 4,
take either of these buses to Mcbean transit center
then you have to transfer again to SCT 3 to six flags
remember to hold on to your metrolink ticket as its vaild
for the buses as well

in a car it takes like 1 1/2 hrs to 2 so im guessing 2 1/2 to 3 hrs

It will be easier to find a friend that has a truck than to “rent” a truck for the CDL testing. I’ve not seen any placed that “rent” semi’s for testing for the simple fact of the insurance and risk.