Watch a Khan academy video on fractions until it makes sense intuitively. If you need to go all the way back to like a kids video, do it. You can only develop math skills by getting an intuition from the bottom. Fractions are one of the more important things you need to figure out. That's a lot of ground to cover in a short amount of time, you'll probably need to spend a lot of hours regularly to go from one end to the other in four months. If you can't do it that quickly, try not to let it bog you down, that's a ton of content for anyone to undertake.