It will require you to do a complete restore of the iPad
by mrmacfixit - 12/28/12 3:30 PM
In Reply to: IPad 2 how do I reset the passcode for restrictions by tndip3
but do NOT do anything until you have read this article a number of times.
Note the warning about NOT doing a Restore. Doing a restore just puts the same, forgotten code, back in again.
Let us know how you get on