Math Recap- Math 2 Recap, 7th grade to eighth grade math?

I am going into seventh grade but I was in math 2 last year (seventh grade) and this year going into math 4 (eight grade math) I need a quick reveiw.... I remember negatives (i.e. multiplying, adding subracting) whats the general rule, decimals, all the surface area, perimiter of prisums, cylinder all of that stuff.. and so on so seventh graders what did yoiu learn last year for short... PLEASE PLEASE HELP ME!!! I had such a hard time remembering stuff from the year before last so I had trouble please help!