Do you need Grade 12 - No, but it helps. POET will weed you out if you struggle with math. Lets face it, electronics theory is math!
What do LCIS guys do? - anything and everything relating ot information systems, installation of various systems (security), radios, running cable, ANYTHING.
The biggest misconception is the LCIS is primarily computers. Computers are such a smaller corner of the LCIS universe. I have seen many potential LCIS candidates thinking the training will be simple "because I have A++,...or, worked on computers before".....or,.....some other computer related background experience, and not make it through POET. Theories relating to capacitance, inductance, Ohms Law, Faradays Law, Lentz's Law, Standing waves - these are just some of the items that you have to learn before you are even loaded on to your LCIS apprentice training.
It is not easy, but it is rewarding as hell. A real accomplishment. I would encourage anyone to try.