First, after you transfer to a new learning environment, it will take some time to adapt to new teachers and new classmates, which will not greatly improve your study.
Second, what I learned in senior one is not difficult, and everything is quite simple. After the second year of high school, you can learn the new knowledge of the second year of high school while learning the knowledge of the first year. Although you said that your first year of high school is not good, you have already studied it once, and it is not difficult to make up for it.
Generally speaking, as an experienced person (I have been admitted to college now), I know how you feel. Don't be afraid of your own decision. When you decide, do it hard!
Finally, I wish you a good high school and a good university in the future ~ ~ ~