Posh Ram

Ooh, how posh!
I get that would be more distracting, it's why I don't really get schools giving out iPads. 
I think the key is to do a couple of hours of focused revision rather than half a day where you keep getting distracted. Try to set up a timetable or something. 
Ultimately I wouldn't worry too much, I used to get distracted all the time (although more often than not it was the kind of distraction @EastHertsRam is talking about ). Also, as long as you feel confident, don't do too much "last minute" revision, it's much more helpful to have a regular sleep pattern and spend the time before the exam thinking about actual exam technique than stressing too much over the finer points of your notes.

I don't think you should leave, just have a bit of self-restraint.
I reckon I managed about 2.5 hours revision a day for my GCSEs which was plenty. Why don't you try to minimise usage of your computer/phone? If you're looking at something on a web address, print it out. Revise somewhere where your computer isn't and try to do a 50-60 minute chunk. In your breaks between revision periods still stay away from the forum, just watch TV for 30 minutes or something.
Then you'll probably be done by about 2 and can meme away as much as you like on here  

Straight outta Compton - 8.5/10
Fantastic biopic and the three main actors were excellent despite little experience. 

Straight outta Compton - 8.5/10
Fantastic biopic and the three main actors were excellent despite little experience. 

Watched 'Under the Skin' last night.Pretty meh overall... except for that one scene with ScarJo. 
6.5/10.
 

Airplane! - 9/10. So funny.

Joey, have you ever been in a Turkish prison?

Gone Girl - 7.5/10. Great plot, but the rest of the film was quite average. Rosamund Pike grew on me over the course of the film. Ending left unresolved but I quite like that in a film. Gratuitously violent and a lot of unnecessary nudity (Emily Ratajkowski ) though.