No, your training has no tax benefit at all either now or in the future - Gordon Brown saw to that.
No, you cannot claim unemployment benefit as you are not unemployed, available for and actively seeking work.
Yes, you can have an exemption from council tax as you are classed as being a student on an approved full-time course of study. As schooner says, OAT will provide the necessary letter confirming this.
No, there are no other benefits/reductions to which you are entitled.
Welcome to aviation training.