Answer:
If you graduated from high school in 2007, you started high school in 2003, assuming you studied high school in the US.
Step-by-step explanation:
High school lasts 4 years in the USA, so we can say that if you graduated from high school in 2007, you started it in 2003. In high school, the choice of subjects is much more flexible; The student has to take the 4 compulsory subjects: English, math, history and politics. The other subjects: physics, chemistry, arts, writing, debate, sports, cooking and others, are optional, that is, the student chooses those who have preference to attend.