online examination system

[mir nazim]

hi there,
One of my client needs a computer based examination system. It should
have following capabilities.

1. It should support Multiple choice questions.
2. It should be adaptive, that is, difficulty should vary with each
question.
    kind of those used in MCSD/MCSE/SCJP etc examinations.
3. should be web based.
4. MySQL support. (better be Database independent)
5. OS independent.

Now please let me know if there is one available for ZOPE platform.
blesses-n-luck