In no case do not go there with zero knowledge! They will not replenish your vocabulary in any way, they will overwhelm you with grammar in Turkish and will ask you when no one has really explained or taught the words. Therefore, learn the words themselves, then take courses to understand grammar. And they refuse to transfer you to an individual lesson or online and do not refund the money, although the amounts are small! You'll be sitting for 3 hours just like in hard labor