Ok, assuming you find a DM mad enough to allow this:
You have 5 levels of Wizard, and ACF spontaneous Divination. Your Wizard class counts as both a prepared and a spontaneous Arcane class. You still need a metamagic feat and the rquired skill ranks, but let's assume you have that.
UM1: You only have one class, so your wizard spellcasting increases by 1.
Your Effective caster level increases by 1, so your spellcasting is now Wiz6, Caster Level 7.
UM2: You have only one class. rant: While you could read the +1/+1 as allowing a total +2 on your wizard level, a DM that allowed this will probably also allow you to cast spells without arcane spell failure while in full plate, while ignoring the fact that you are not proficient with armor, so go ahead and buy that armor. Or just write it on your sheet. He's probably not checking your money either. make it a +10 ghost touch armor while you're at it. Who cares about restrictions. /rant
Oh, and you get to add a wizard spell from your spellbook to your spellbook. Woohoo.
UM3: Augmented casting. Taking this class feature literally, you can not actually use it, since you dont HAVE another class.
rant: Also, in case your DM let's you add the spellcaster level twice, pick some class features from other classes that take your fancy, like sneak attack. It's not like he's paying attention /rant
UM4-10: rinse and repeat. also get some bonus metamagic feats. rant: Take persistent spell, and apply it to spells outside of the normal requirements. Apply it to spells normally taking one round(this is RAW, actually, but considered overpowered by many). Also, don't expend any spells to do this. as mentioned, your DM is not paying attention anyway./rant
Conclusion: If your DM is ignoring basic balance like this, you could end up with spells of a 22 lvl wizard at lvl 15, with a caster level of 26.
Please treat the rants as humorous comment. It's how they are intended. Reading through the class, I just couldn't imagine a DM allowing this.
Also, I can't imagine what you thought you'd get out of it.