No you can't.
You ranks in a skill max out at your level + 3.
So the most you can have is 8 ranks. Plus, let's be generous, 2 for constitution on a (non-dwarf) wizard and +5 for an item, you're really looking at pretty much 15 as being a reasonable maximum at level 5. You could squeeze a few more points (up to 4) out of constitution by being a dwarf and really maxing out Con... but you are a wizard after all.