To avoid double learning of subjects you should take module 7,9 & 10 the respective essay together with the multiple choice exam.
Study module 17 and module 8 together.
Study module 6, 7 multiple choice and module 7 essay together.
I recommend students to study module 1 to 5 together or in two steps.
Free study material is here
www.easa-66.eu/BBS
I hope that helps.
easaman