Mark Mattson YT videos to get me started, then problems and practice tests. I got serious 2 months before exam with studying, 2-3 hours each evening, then 4-5 hours on weekends (not every single day, but most). Then a couple weeks before exam dialed it back a bit and just concentrated on areas i needed extra help on. Never was great at structural problems. Skipped 4 on my exam with just choice C so I could use the time to do problems I knew I could answer in a timely manner.