First time test anxiety ahead of major test: Non-drug recommendations please?

I'm studying for a gigantic graduate school exam where most people fail. For the first time ever, I've got test anxiety, badly. This is probably due to NOT being 100% prepared, which is normal for this test.

Can you recommend any good therapists for this in Massachusetts?

Can you recommend any great websites or online videos/recordings that might help?

Can you recommend techniques or anything else?

Part of what's setting me off: Every time I take a practice test, there's at least a few questions that are either worded in an ambiguous way as to make 2 answers 100% correct. It seems as if the test maker is unaware of this issue. I have NO CONTROL over that and worry that on test day this will come up again and again. Sometimes I don't recognize the ambiguity until I correct my answers and find out that the test maker had a completely different interpretation of a statement than my own. I have run this problem by tutors, study groups, and professors, all of whom agree about the ambiguity and often (not always) just magically seem initially read it the way the test maker intended. Then when I point out the other perspective, they see that too and really can't say why one is better than the other. It's like that drawing of the old woman and young woman where it's 100% perspective, not right or wrong. I have bad luck and just can't stand this unfairness, unpredictability, etc.
http://psylux.psych.tu-dresden.de/i1...ambiguity.html

I can recommend:

Martha Weiss, a therapist specialising in anxiety, and she is in Boston
The website MoodGym
Breathing exercises - in through the nose out through the mouth 3 times
A bath
Yoga
Going jogging
Boston Anxiety Therapist - Fears Therapist Boston, Suffolk County, Massachusetts (MA) - Anxiety Counseling Boston
Kati Morton is a Youtuber therapist who has some great videos on coping with anxiety
Mindfulness - google it for good anxiety techniques