work, power and energy, uses an effects of electricity, heat, light, sound, atmosphere, acid and bases, metals, atom separating mixtures, ecology, plants, reproductive system, skeleton comes up nearly every year. I think you should focus on these.
I felt the same doing mine, but don't worry.
I did an excellent project that I put hours of work into. And I competed my paper and project trí Gaeilge. The Irish guaranteed me nearly 10% before started at all. As well as the mark from the project and exam copy.
And the paper was an absolute disaster, and I still got a B.
So don't lose hope just yet:-)