Unfortunately you need to practice to pass these tests, that's it. It's not really reflective on your competence as a developer it's just a different skill set.

Unfortunately you need to practice to pass these tests, that's it. It's not really reflective on your competence as a developer it's just a different skill set. The anxiety will become more manageable as you get better at solving the leetcode style interview questions. I would purchase leetcode premium and start working your way through the top 100 most common easy and mediums. If you are trying to land some FANG job offers, then I would also spend sometime working through the top 25 Hard problems too. But start with easy.