John would like to find out how his three friends (Tom, Jen, and Roy) did in MATH class. He knows that

-if Tom did not get the highest grade, then Roy did.

-if Roy did not get the lowest grade, then Jen got the highest grade.

Is it possible to figure out the ranking of the three friends? If not, what other information do you need? (Hint: use truth tables)

I've set the variables for all the statement;

p: Tom got the highest grade.

q: Roy got the highest grade.

r: Roy got the lowest grade.

s: Jen got the highest grade.

Please help me with this.

I've tried all possiblities but I cannot come up with anything.

Thank You...