I took the old test back in Feb. You can basically always rely on Wendell Odom. He puts out a book every couple years. David Bombal is also on Udemy and I used his course but you should be fine using Neil Anderson's.I used Boson practice tests as well but only did 3 because I ran out of time but everyone recommends them.I also watched Jeremy's videos from CBT Nuggets. He always manages to inspire me to keep studying when I don't feel like it.I used a home lab and packet tracer. You can get by with just packet tracer.
I think there is 15% new content and some things like BGP and EIGRP dropped. The exam blueprint will guide you. If you have current experience and you have down the basics you should be fine. I also used www.subnetting.net so I was pretty handy at being able to look at an IP address and know how to answer question quickly.