Given that you seem to be able to write English to level 6 I would not worry about your certificate. It will take care of itself during your training.
Research the schools at the airfields you have listed and visit them personally. Get a feel for them as some will be more receptive and welcoming than others. You'll be surprised at how lax some are at greeting new customers. You'll instinctively know when you feel that a school is 'right for you'. That would be the time to ask for recommendations online.
Of the airfields you list all have excellent schools.