Eli is creating a SMART goal for her MCAT to get into medical school. She took a practice test and received a $498.$ She has three months to prepare for the MCAT. After doing some research and figuring out her practice schedule, she now thinks she can increase her score by $15$ points. Therefore, she makes her SMART goal to get a $513$ on her MCAT. By making sure that the MCAT score is not too easy or difficult, what aspect of the SMART goal is Eli attempting to cover?

a$.$ Measurable

b$.$ Achievable

c$.$ Relevant

d$.$ Time$-$bound