Nothing is inpossible!
I did take the all 14 exams and passed in one go.
My background at the time? CAA standard CPL, ICAO ATPL, 4000 hrs total, 1500 airline captain multicrew turboprop.
Study 2 months with jeppeson books and distance learning material from AFT Coventry and 5 day brushup before the exams.
I do not recomend it to anyone as it proved to be very hard phisicaly and mentaly!
I average marks on high 80s with two 100 and two 76.
At the end of the day I was just lucky and I can say that most of the merit goes for my previous knowlege and experience and the good tips on exam technics at the brushup. unfortunately there was litle feedback questions at that time, but I think it woudnt have made big diference anyway.
My advice: if you have time, do it the proper way take it in two sessions, take the time to learn your subjects, it will not only make you proud of your exam marks, but you will definetely need that knowlege in the future.
Fly safe
Yebo