Trisha is a first-semester senior in high school who learned in her personal finance class that it is important for her financial future that (A) she starts establishing credit soon, and (B) she works toward continually improving her credit score so that she can rent an apartment, buy a car, and qualify for other opportunities by the time she graduates from college. Devise a plan for each year below so that Trisha achieves her goal of a high credit score. Be specific about what actions she could take at each checkpoint.

--Before she graduates high school
--Freshman year of college
--Sophomore year of college
--Junior year of college
--Senior year of college