My iPhone 4s won't let me turn my Wi-Fi on?

I've had my iPhone for a while now (longer than a year I think) and I haven't had any trouble with it before but my Wi-Fi was playing up yesterday so I turned it off and I tried to turn it back on and it greyed out so I can't even turn it on anymore. I've had a look on the internet to see about other people having the same problem and a lot of people have been saying it's because of the iOS6 update but I've had the update for a while so I'm not sure what it could be.

I've tried turning it off and on again multiple times and resetting my network settings and I've done a reboot by holding down the home button and sleep button, but nothing seems to be working. Does anyone have any ideas on what I should do to get it working again?

IPhoto, imovie, etc not on my mac?

I recently had my OS reinstalled through best buy because my mac stopped working. They did not charge me or anything but this was a while ago. Today I wanted to take photos off my iphone using iPhoto but it is not there. Then I realized imovie, garageband, and all the iLife apps are not there! I read that there are two discs that come with the mac to reinstall software and apps, etc but I have the macbook pro with retina display that doesn't have an optical drive so no discs were provided… I don't want to buy iLife because it was free with my mac in the first place… If I bring my mac to the apple store, and tell them what happened, do you think they will put iPhoto, etc back on my mac?

What is it called and how do I get it on my screen?

I have the iPhone 5. There's this thing that I don't know what it's called and my friends have it on their screen. It's like this button thing that you can drag around your screen. What is it called and how do I get it on my screen.

Oh god i can't focus while studing

Well i need to read 3 hard books! Radiology, Histology and Phytology! They are about 300 pages
I need to keep all these stuff in my brain for final tests! But i can't i can't remind them as i read
It makes me hopeless
And i'm just playing with my iphone oh god!
Help what should i do?
I need to pass the exams