The first revision of the LAPL/PPL exams is now with the CAA. As stated in CAP 1192, the number of questions will be significantly reduced. There will probably be 6, not 9 exams; 3 double subjects and 3 single subjects.
It has also been proposed that the (a) to (d) answer sequences will also be randomly changed, to make it more difficult for cheats to learn that the answer to question 57 in Paper 8 is (b), or whatever...
A further revision will then be conducted, to develop more reasonable questions which the average trainee should need to know and answer without difficulty - it is hoped that this second revision will be released along with the LAPL/PPL AltMoC next April.
So waste your money on an 'app' if you wish; pretty soon it'll be useless!