You’ll get better at managing test anxiety by taking a good number of full-length mocks. As your accuracy becomes more consistent, your confidence will grow and the real exam will start to feel more familiar and less stressful. Some experts also recommend mindfulness practices, so it may be worth adding a short daily routine and seeing if that helps you stay calm and focused.
In terms of improvement, I think your biggest opportunity is consistency in your strongest area. Doubling down on Quant and minimizing errors there could be the key factor in pushing your score higher. Focus especially on avoiding mistakes on easy and medium questions, since those are the ones that tend to hurt scores the most. I also see some room for improvement in Verbal. You could try Marty’s streak method and practice by topic, moving from easier to harder questions. That approach helped me improve my accuracy quite efficiently.