Geometry can be hard depending on your math background. Math is a sequential subject. For example, if you do not understand the basics of algebra 1 and 2, then geometry might be a problem. It also depends on your teacher's ability to easily explain geometry in class. I recall very few math high school teachers. The teachers I do remember, were excellent at what they do for a living. Make sure to review your algebra concepts during the summer. It will help to get ready for battle in geometry land.
Guido
P.S. Make sure to understand geometry terms like: line, ray, angle and the rest. Okay?