Dear Nabhanya,

 Please consult

https://sites.math.rutgers.edu/~zeilberg/Hist21/mt1S.pdf

for the full solutions.

You got  108 points (out of 120).

Here is what you got wrong:

#7: -2 points (an EF is a sum of DISTINCT unit fractions)

#12: -10 points (not attempted)





 Best wishes,

   Dr. Z.