It depends on where you are delt into preloading. If they see you as a great jumper, which probably will happen since they brought you back, then they automatically assume you can handle the hardest of sets imagenable. Preload in a lot of situations is harder then any other job within the building, and can be also said for the driving job. I've seen countless of jumpers brought back after knocking it out of the park, then soon after quitting before a month past.
I dont mean to scare you, but I mean to bring you realization. Who knows, you could land a cake job, working a long slow belt. A boxline or an outside PD house is a whole different ball game.
The boxline will tear your hands, arms, shoulders, back, neck, knees and soul from your body each and every waking moment on the clock. While a outside PD house knows only two speeds, slammed and crushed.
I can understand your excitement on getting the job, congratulations! But the real job is on the inside, always remember that.
First day, you should get a shift long class, and a practice test. Second day, should be you working with a soup training you on what to look for. Finding the slap, shelf placement etc. If they are good, you will be getting pointers and shown things most of the night. Dont miss out on each and little bits of information. The rest of the week should alot of the same as the second, yet great soups like that you'll probably never see anyways, expect to be given the shaft early. The last day of the week, you should get the so-called "real" safety test that gets you to work. Good luck!