UK - Advice on exam order to get done ASAP?

I started my grad role in Feb, I took CT1 and CT3 in February and passed and I am taking CT4 and CT6 in September (I am moving near the exams so really did not want to risk failing).

After this I want to prepare to get through the exams as soon as possible.

I am thinking:

Sept 2017 - CT4,6 and CT9 in October (booked already)

April 2018 - CT5, CT2, CA2

September 2018 - CT7,8

April 2019 - CA1

September 2019 - ST7,8

April 2020 - CA3,SA3

Assuming I pass all of course. I am worried about taking CA2 without finishing the CT's (the syllabus says it can be based on CT1-8). I don't mind putting in the extra effort to do 3 in a sitting, but I am not sure the best way to organise the exams