No, you would need 2500XP to become a L2 Wizard. 5000XP to become a L3 Wizard etc.
You cannot use any of your fighter abilities (i.e. THACO, weapon proficiencies) until your mage level surpasses that of your fighter level.
So your mage needs to advance through levels 1-11 using the mage experience chart before you regain the use of your L10 fighter abilities.
Clearer?
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