Irrelevant query! Appreciate if you could please advise

Dear John, I do appreciate if could you please advise why opentution doesn’t support Advance Tax. I have passed all Last 12 papers only and only through Opentution notes and due to time pressure as a busy mum, wife and employee had to only refer to the lectures whenever had difficulty to undrestand Notes. I didn’t even buy Kaplan or BPP revision kits for the first 9 papers and only started to buy Kaplan revision kits for SBR as no previous exam papers available free in ACCA to download ( as a result of recent changes). i am working as an Accountant in accountancy practice and therefore I really aim to study Advance tax but so worried to change my strategy of study and move from open tution to Kaplan documents. Do you think 250 hours will be enough to go through Kaplan documents to get ready for Jun exam. I only spent 100 hours for f papers and nearly 200 hours for each SBR and AFM and managed to pass all at first attempt with high score above 72% for most of them! ( have not received AFM result yet as i just had exam on friday but i am confident will pass). Now regarding my background I really appreciate your advice if it would be a good idea to study AT or better to keep the way of my success and study APM through opentuition. I still have SBL apart of AT to complete my journey of Acca and no time to resit for second time as already my study affected quality of my family life:(