How to remove password for the recovery mode wizard which you get by pressing command   r while booting mac with mac os 10.10?

I've set that password long ago and now forgot on how to remove it.
Should I go to Apple store for this?

It's possible you set a firmware password, see if the password dialog is similar to the one on this site…
http://osxdaily.com/2014/01/06/set-firmware-password-mac/
Those passwords prevent ALL startup key combinations. Confirm it also happens when you boot holding T (target disk mode - How to use and troubleshoot FireWire target disk mode - Apple Support) If that goes to the password dialog you have a firmware password set.
Apple suggest you take it to an Apple store to get it reset, you can't remove the battery or remove RAM to reset this, so only Apple should reset it.

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