I think that the budget should be greater than 25k€. Expect extra costs like the medical, flying home for holidays, activities during the training, transport, hanging out and a margin for unexpected costs.
By the way, for those who finally manage to get into AL, what's the salary for a a cadet the first two years? (including deductions if any) In other schemes the salary in the first months is not enough to live, then you have to budget for that too.