Even though you're working and experienced in your respective field, it is wise to brush up on those lost memories.
The Broad Approach
This strategy requires you to familiarize yourself with all of the fundamental concepts. Some of these concepts may have already been covered in your undergraduate studies.
The Ideal Solution
The ideal solution would be to pick a study solution with an exam-type approach. This helps you in planning your time allocation for each topic during the PE exam prep course. Focus on topics according to NCEES PE exam specifications.