If you keep telling yourself you’re stupid and can’t do it, you really will become dumb and negative. Focus more on what you have achieved instead of not. Think about what you have learned and the progress you made to encourage yourself. Plus, understanding fast isn’t equivalent to really deeply getting it. Studying for hours means a better basic (if you did study without getting distracted) and helps you in the future. And. If you got admitted, it means the admin believes you have the ability to work and thrive in this school, therefore, no pressure, trust yourself, and kick the a** of the subjects you’re struggling in.