I've got labs available that I rent out for training sessions as well as to individuals. If you want to know more, have a look here: https://www.abct.net/labs/ or drop me a mail: email@example.com .
We can give you full access to 2 licensed F5 VE's with backend servers, as well as BigIQ's (CM's and DCD's) if required. If useful, we also facilitate exam workshops.
Disclaimer; there's other options out there of course 😉
You can also check out F5's paid digital education available on LearnF5.com. You purchase this training with training units. Once you register and sign-in, navigate to Learning > Your Learner Home and click on the slider that looks like this:
One of the self-study curricula available in the Digital Education program covers BIG-IP DNS and includes extensive hands-on labs to help you learn how to configure the product. The curriculum also includes lecture to cover BIG-IP DNS concepts. This self-paced training is an alternative to the Configuring BIG-IP DNS instructor-led course also offered by F5.