I know f**k all about being a pest controller, there are plenty of lads on here who do, so I am sure they will give you plenty good advice. But, I do know that once you are over 18 (or in some cases 19) there is no such thing as free training. Its very expensive (I've just shelled out £200 for a 3 day course, and this is cheap). My advice would be to finish your A-levels first, then look at doing something else. Its free training, and once you have them no one can take them off you...