This information gets from the different website and tries to provide you an expert opinion.
Luis Alberto Furlan
National University of Cordoba, Argentina
Test anxiety is more specific. Academic anxiety includes several experiences in academic settings, like studying, asking teachers for doubts, seeking academic help, take notes, etc.
Savitribai Phule Pune University
Definitely, test anxiety reflects more on some conditions or phases at which person gets anxious which overall academic anxiety related more on scholastic problems or less coping in academic set up. This can be measured by STAI (both for state and trait anxiety)
University of Split
Screen for Child Anxiety Related Disorders (SCARED)
CHILD Version—Page 1 of 2 (to be filled out by the CHILD)
Developed by Boris Birmaher, M.D., Suneeta Khetarpal, M.D., Marlane Cully, M.Ed., David Brent, M.D., and Sandra McKenzie, Ph.D.,
Western Psychiatric Institute and Clinic, University of Pittsburgh (October, 1995). E-mail: email@example.com
See: Birmaher, B., Brent, D. A., Chiappetta, L., Bridge, J., Monga, S., & Baugher, M. (1999). Psychometric properties of the Screen for Child
Anxiety Related Emotional Disorders (SCARED): a replication study. Journal of the American Academy of Child and Adolescent Psychiatry, 38(10),
More general but maybe you can find something helpful.