I was wondering if anybody here has found a great app for keeping track of their GRE progress on their iphone...

Criteria for app:

Ability to count down to date of exam (simple spreadsheet function)
Ability to chart my progress on a graph
A grouping feature would be nice:
i.e. - Barron's test scores grouped, ETS Powerprep test scores grouped

Here's my personal experience:

Roambi:

Positives: Excellent graphing features and compartmentalization/grouping
Negatives: Updating of data must be done on the computer, tedious data entry through excel

Final score: 3/5

Mariner Calc:

Positive: Easy to use spreadsheet application, ability to edit excel files on the go, plethora of formulas available (read: averages, etc.), wifi access to computer
Negatives: No charting/graphing features, pricy

Final score: 3/5

iSpreadSheet

Positive: Ability to edit data on the go
Negatives: No charting/graphing features, Formulas are shady/sometimes don't work, wifi updating not as good as Mariner Calc.

Final Score: 1/5


Anybody else? I'm really looking for a good one if you've found any, or even if you've used a separate app to help you out... maybe your using a bootleg finance app that works perfectly? any suggestions appreciated