Good day,
The “only” UAE GCAA ATPL provider that is accessible to all and that Fly Dubai wants you to complete the ATPL theory with is Fujeirah Aviation Academy.
they charge about $5k for the Distance learning.
they use the Bristol GS CBT and question bank.
The earliest you can apply to attend the refresher groundschool is 3 months after you have finished all the lessons.
refresher ground school run Monday to Friday on the 1st week and Monday of the second week. 6 days total. I think they run this every 3-4 months.
after completing the refresher GS, you can schedule the UAE GCAA ATPL exams which are also done at Fujeirah Aviation Academy.
note the academy is in the city of Fujeirah, about up to 1.5 hours away from Dubai.
all the best!