High school grades

I am a freshman in high school and have been really struggling with my grades. Last year I was a straight-A student but this year I have really been struggling, especially in math. My GPA is a 3.6 and I get really stressed, especially by looking at all of the harder classes I have applied for next year. Most colleges look into freshman grades and I only have a month and a half of school left to make my grades go up, any suggestions as to what I can do?

There are a lot of great YouTube video channels for math. What math level are you taking this year? I may be able to help you find good channels that helped me.

And what other subjects do you seem to be struggling in?