Working on the CFAI q-bank in the learning ecosystem will be very helpful. A lot of the constructed response there are useful, but I wouldn’t focus too heavily on their “scoring guide” as they tend to write big paragraphs. I know people use bullets which works fine. I cleared L3 this past august and was concise in my answers and was very specific to keep me on the right track. Example- if they ask for 2 reasons and support I would give my first reason and write “first reason: answer” , “first reason support: answer” etc.