When you specify Arabic as the character set and ARA as the handwriting style, then you must also:
Open the file called EHClassifiers.ini, located in FORMS' program directory (usually C:\Program Files\ReadSoft\FORMS\Bin).
Remove the semicolon (;) from in front of "Classifier2=Arabic_All_1.CLF".
Save and close the file.
Note that only numbers are interpreted when you use these settings. Letters can be added manually by the Verify operator, however.