You can download the ACT for math anxiety protocol developed by Zettle (2003) here: https://contextualscience.org/ACT_For_Math_Anxiety_Protocol
This is the protocol that was tested with college students relative to systematic desensitization for math anxiety.
Zettle, R. D. (2003). Acceptance and commitment therapy (ACT) vs. systematic desensitization in the treatment of mathematics anxiety. The Psychological Record, 53, 197–215.