HELP I HAVE TEST IN AN HOUR

A student from
High School goes to Knott's Berry Farm to study the total
mechanical energy of their roller coasters. The student measures a roller coaster's total
mechanical energy at two different points (A and B).
Point A has a total mechanical energy of 600,000 J
Point B has a total mechanical energy of 550,000 J
Compare the total mechanical energy of Point A and Point B. *
Point A has a greater total mechanical energy than Point B does.
Explain in more detail about how you compared Point A and B using your
understanding of the conservation of mechanical energy.
PLEASE HELP ME WITH THESE TWO QUESTION J AM GENUINELY STUCK