I couldn’t recommend more Bristol Groundschool, thanks to them and their amazing team I managed to convert my ICAO ATPL to an EASA ATPL in the best conditions possible.
The process started with contacting their team (special thanks to George) who guided me to exactly what I needed to do and what study materials was needed.
I enrolled in their “Licence Conversion Courses” which includes everything required to pass the exams.
The best part of it was their application ATPdigital who has all the 14 subjects, chapter by chapter, with questions at the end of each class to make sure you understood the main points, it was like having my private teacher anytime anywhere (it even work without wifi!). I managed to score an average mark of 95% and passed all the subjects the first time. If I needed to do it all again, I could not imagine doing it without Bristol Groundschool.