If you are weak in several UCAT sections, it can be difficult to know where to start.
The best priority is usually the area where you can gain the most marks with focused practice.
Do not automatically choose your lowest score. Ask why it is low.
If your QR score is low because you have forgotten basic percentages, that may improve quickly.
If your VR score is slightly low but already very consistent, improvement may be slower.
Look at both performance and fixability.

You should also check whether one section is taking up too much revision time for very little return. Sometimes a smaller weakness elsewhere is easier to fix and gives you a quicker overall gain.
Use your question-level data if you have it. A section score can hide a very specific problem.
You may not be “bad at Decision Making”. You may just be bad at one subtype.
Prioritisation is about being strategic, not emotional.
Spend time where it is most likely to produce improvement.

