No, you more than likely can't.Skipping a year?
Can I ask trinity to do that for me?! (4 years instead of 5) Because I will be with high school grads in class. Can't they count some of my undergrad courses?
RCSI and UCD offer a pre-med year (6 year programme), however in some cases you can slip this, and you will be offered the 5 year programme, going straight into first med. If you've completed an undergrad degree, then you will skip pre-med more than likely. However, that being said, if you have already completed an undergraduate degree, then you should really apply for the GEM programme (4 years)
In contrast, TCD *only* offer a 5 year programme, straight into first med. They don't have pre-med, and they don't have GEM. Therefore, you can't skip the first year, or any year. (I'll caveat thism saying that there may be some exceptional circumstances). However, if you have done say, a biochem or physiology degree, then you may be exempted from those modules in TCD. This is not the case in RCSI or UCD, as they offer a systems-based approach, so there are no individual biochem or physiology modules.
I can't really speak for UCC or NUIG, however they would be more similar to RCSI and UCD I imagine, particularly NUIG.