tips for algebra 1 honors

I'm currently in eighth grade right now taking algebra 1 honors, which I am only in because of my state testing scores.  I'm glad to be on the "accelerated" track when it comes to math but the problem is that I don't comprehend the material well enough despite getting some assistance from the teacher. Right now, we're learning how to do linear functions and graphing and it is literally kicking my ass. I am stressed out right now because I have to take an End of Course test on all of the units that I have learned in May, and I get anxious every time I have to take any test.  I currently have a B but it could drop at any time. If anyone has any tips on how to get through algebra 1, it would be very appreciated since I am struggling with the material. 

P.S, the only reason I have a B in algebra is because I had made a D on a test during the first quarter of the semester, and it was put in as a grade for the second quarter of the semester. But then, I made a 100 for simply writing down the notes for the unit we are currently learning and it brought my grade up to a 82% B.