In short, no. Here is the right order in which to sit your tests:
You must pass module 1 (theory tests) before you take module 3 (practical test).
You must pass module module 2 (DCPC case studies) before you take module 4 (DCPC Practical).
You can take modules 1 & 2, or modules 3 & 4 in any order.
If you do not intend to drive an LGV commercially or for hire or reward, you do not need to take modules 2 or 4.