Hey
TMARTENSSON,
Sounds like you've hit the 'plateau'!
The 'plateau' is what we call that phase when you've done your studying and know the material but seem to have stopped improving - you just keep making the same mistakes and keep missing the same types of questions. So how do you break through this glass ceiling?
Usually, the answer isn't more fine-tuning, it is an adaptation of strategy.
For example, you say you know the concepts but don't know which to apply. This suggests that you are focused in on what we call the 'Precise' solution approach - trying to fully solve a question by applying the correct mathematical rules / equations / concepts. Oftentimes, this is the wrong way to go! If you can reach the correct answer without actually solving the question (for example, by eliminating impossible answers) then there is no need for you to be able to pick out the 'right concept'.
As another example, you mention that you tend to make silly mistakes. Do you use simple numbers to verify your calculations or your logic? Making an abstract problem concrete with examples can make it much easier to avoid falling into logical traps. This is an example of what we call the 'Alternative' approach.
So: in addition to fine-tuning your current approaches (for example by working more carefully, writing clearly, reviewing errors, etc.) I suggest you consider a shift in strategy - is there a completely different way to answer questions that you've so far missed? Feel free to PM me if you'd like more info or check out our Intro to PAL video
here, which explains different strategic approaches in depth.