All of you who are going to do a CLA exam should ask your local NI office or NI Certification team if there are any online CLA Preparation sessions coming soon. Those will definitely help you to pass the exam. You will avoid the typical mistakes and get good tips & tricks. I have prepared personally lots of people to CLA exam and most of them have passed. I think the biggest problem, as Rolf pointed out, is the fact that people will code too much (we all love to code). It's good to practice some structures before the exam but do not directly copy the ones from the examples (for example the error handling). Just create your own way to solve those examples and practice those structures/VIs. Also remember what kind of grading system there is. Where all the points are coming? There are "easy" points and "not that easy" points
Style: 10 points <- Easy to get full points
Documentation: 20 points <- Easy to get full points
Requirements coverage: 30 points <- Easier to get full points
Architecture development: 40 points <- Challenging to get full points
So DO NOT loose those ”easy” points ;-) You will need 70 points to pass. So create your architecture, clean, documented code and try to add most of the tags to the code by using documentation + some coding. You will not loose any points if your VIs are broken so do not spend any time to make them run. You can also write the documentation with your native language (might help those who does not have English a native language).
Good luck for all of you who will try to pass the CLA exam!