If I'm not mistaken, there is a 5 year time frame for you to complete all modules, and the clock starts the day you pass your first module.
My suggestion is, go for the hardest module first (touchwood) you do not pass, your 5 year time frame has not started yet.
Imagine if you do all the easier modules first, and it's been 4 years already. You only have 1 year to pass the hardest module. With 1 year to go, you maybe have another 4 attempts?