how can i get 90 days access

Hey hey!

Check out this link: https://community.anaplan.com/discussion/137668/start-your-certified-model-builder-journey-with-anaplan-talent-builder#latest

You will have to apply for it but if you go to Talent Builder in the Academy section, you can apply for a workspace. There are some requirement though so be sure to check those out.

Good luck!