mechanism

step1. lone pair of O attacks H⁺.
step2. pi electron of C=O moves to O⁺, consequently one of the double bonded pi electron shifts, leaving + charge on meta to C(at which OH is attached).
step3. Ring expansion takes place.
step4. + charge comes to 3degree carbon
step5. elimination to get Benzene ring

i did the same but i was confused abt last step.....
well thanx buddy.....