You will be hard pushed to do it in 21 days!
Assuming weather is good every day so you will fly a minimum of 2.2 hours a day plus learn all the 9 exam subjects, me thinks that is a tall order !
AS for 9500 euros that just about coves the cost of fuel and the instructor ( fuel is 2 euros a litre times 36 litres an hour times 45 that's about 3500 euros just in fuel )
As an instructor with 6000 hours teaching I doubt very much you will be ale to do that, but best of luck trying. A question though, how do you accelerate the course ?