[Familiarity with the Ti-84 Plus CE handheld graphing calculator is still crucial to optimizing math scores on the ACT.]
I'm not aware of any succinct, comprehensive exposition of Desmos skills required for use on the dSAT (I'm working on it).
At this point, the best one can do is to peruse the various official materials linked in the "Desmos First Steps" and "Desmos Graphing Calculator" sections below.
Check out each link, read the information provided, and do the sample exercises until you've covered all topics presented (search Google for additional help with particular topics).
Desmos First Steps
User Guide
Quick Start Guide
Getting Started: Desmos Graphing Calculator
Getting Started: Creating Your First Graph
Getting Started Articles
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Desmos Graphing Calculator
Graphing Calculator
Graphing Calculator: Essential Skills
Graphing
FAQ: Graph
FAQ: Student Graphing
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Desmos Geometry
Geometry
Geometry Tool
Transformations
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Other Desmos Calculators
Scientific Calculator
Matrix Calculator
3-D Calculator
1600.io Mastering Desmos Course
Tutorials
Desmos YouTube Channel
Keyboard Shortcuts
Help
Tutorials
Desmos YouTube Channel
Keyboard Shortcuts
Help
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