I must start with that I have only done the PPL theory (9 mini-exams in like 2 hours in January) and have just trained for some weeks with the AE question base. But I have the feeling it will not be soooo hard with the ATPL if its true that you get more than 75 % already known questions unless you have some extreme bad luck. So if its just about passing the exams (since the knowledge both from the books and from your instructors that you need in practice is much more than you get asked about during the exams + some of what you get asked about is probably not really useful in the cockpit) then it will probably work to remember all the AE questions and answers since people say they get from 80 to 90 % already known questions on the exams (I guess its the same question base in all EU nations since all give the same license).
So if you just train some hours everyday (just skip slacking and telling yourself its still some months until the exams, just do the questions everyday no matter. In the end you will dream about them at night and then its probably doable to get all done in a 2 week session. Oh and do not forget reading the books and calculating stuff since there will be unknown questions on the exam + later on probably no one wants to screw up after getting invited to the airline interview cause of not knowing the answers to their questions.
Ofc. if you got a job, a family etc. then its not so simple to have all the necessary time to quickly learn everything and really understand it. I am talking about the situation when you can concentrate 100 % on your flight training.