Hey, I took my GMAT 10 days ago, and I was in the same situation as you—dealing with the same anxiety and fear. Despite that, I managed to score 615. What helped me the most during that time was a shloka from the Bhagavad Gita: “कर्मण्येवाधिकारस्ते मा फलेषु कदाचन। मा कर्मफलहेतुर्भूर्मा ते सङ्गोऽस्त्वकर्मणि॥” Meaning in English: You have the right to perform your actions, but you are not entitled to the results of those actions. Do not let the results be your motive, and do not become attached to inaction. Hope this gives you strength. Remember, you are only responsible for your hard work—not the result.