There 4 types of science. You will take one each year.
Your 9th grade year you will be taking physics. In physics the things that you will be learning about are Fundamental concepts, Mechanics, motion, fluid mechanics, electricity , magnetism,waves, atomic, nuclear, and particle physics ,and advanced topics for explaration.
After physics you will be taking biology the next year (your 10th year) The topics that are in biology are Macromolecules, Diffusion and osmosis, homeostasis, cells inside a persons body, virology, immunology, and evolution, and potentially more.
In 11th grade you will be taking chemistry. The topics in chemistry are acids, bases, and pH, atomic structure , electrochemistry, units and measurements thermochemisry, chemical bonding, periodic table work, equations, and solutions, mixtures, and more.
Your 12th and final year you will be taking ed science. In ed science you will be working on the the same things you have worked on in previous science classes, and applying what you have learned to do advance work dealing with the same things you have learned. There will also be topics you did not cover or gone over in physics, biology, and chemistry.
Note that when the MCAS comes you will have to take the Physics MCAS, If you don't pass you will have to take the biology one which is harder than the physics one. Same thing goes with if you don't pass the biology MCAS you will have to take the Chemistry MCAS which is harder than the Biology MCAS. The difficulty of the Mcas gets harder and harder. So make sure that you do well on the physics MCAS so you don't have to keep taking the harder tests as you go forward.