It depends on how you wish to tackle them...
Do your larger modules first, they take longer to revise for, get the biggies out the way first, then the rest will feel like plain sailing.
Or, if you're not the quickest of learners, start with your smaller modules and build upto the larger ones.
I dont believe theres real answer to your question, it all depends on you. Your learning technique, how quickly you can absorb information etc etc.
Everyone has their own way of tackling the academic side of the trade.