open incognito page (ctrl+shift+n) and use invite link for registration. you will get premium tank locust and some free gold. you could find another invite links in google. invite links are not invite codes. its working in incognito page only.
on registration page use invite code YOGSCAST for premium tank excelsior and some free gold. you could find another invite codes in google.
dont start game before you confirm email from wargaming and use bonus code TANKSHOT for premium tank pz s35.
you will have enough free gold for premium tank churchill lll.
find commander and you will get premium tank su-122-44 from referral program.