Dictionary.com Dictionary & Thesaurus - Free Of course there is going to be a time when you need to look up a word, but instead of flipping through a book just pull out this app. The offline capabilities make it a must.

Free Books - 23,469 classics for less than a cup of coffee. Well "free" may be a bit of an exaggeration for this $1.99 app, the fact that you only pay a one time fee for this many books vs many other book readers can come in handy.

WolframAlpha Just like their website, WolframAlpha can help you with a large amount of questions that may have been bothering you, but in a nicely designed app. Internet required.

iBlueSky (mindmapping) Put away your paper and pen and let iBlueSky do your paper preparations for you. If the $9.99 price tag is too high for you there are many other apps which you can choose instead.

Mental Case Flashcards Perfect way to cram for an exam with these handy cards.

iStudiez Pro There is a plethora of timetable apps out there and I haven't yet had the chance to review them all but this, like many others, is handy to keep track of your day.

Evernote A great way to sync text, photo, and voice notes to both your iDevice and your computer.

Convert Units for Free - #1 Unit Conversion App One of many easy ways to convert units without having to think yourself

Solipskier Not educational but of course everyone needs a break, all work and no play and all that. This game is good because not only is it addictive, you only need one finger to play thus making it a perfect way to subtly waste your time!