I'd say practice practice practice. Try to create a testing environment which is close to reality. Also if you currently applying and interviewing for jobs, I'd

I'd say practice practice practice. Try to create a testing environment which is close to reality. Also if you currently applying and interviewing for jobs, I'd prioritize then and start with the ones I find less interesting. Another idea: Find a local meetup group or something similar where you can give a talk about performance anxiety during interviews. Just tell your story to others and you'll get invaluable feedback. That said I know you asked here for advice, but discussing on a forum is too asynchronous. More like a take home test as you already described.