H/W HALFTERM | Python Fiddle

name = raw_input("What is your name ?")
print("Nice to meet you " + name + "!")
age = raw_input("What is your age")
print("So you are " + age + "!")
year = raw_input("What year are you in ?")
print("So you are also in year " + year + "!")
(numEntered) = raw_input("What is your score out of 80 ?")
numEntered=int(numEntered)
if numEntered >= 0 and numEntered <= 80 :
       score = float(numEntered)
       percentage = score/80 * 100
       print("The percentage is " , percentage)
       if int(numEntered) >= 0 and numEntered < 6:
            print("That tells us that you got a U in your GCSE mock!")
       elif int(numEntered) > 7 and numEntered < 13:
            print("That tells us that you got a G in your GSCE mock!")
       elif int(numEntered) > 14 and numEntered < 20:
            print("That tells us that you got a F in your GCSE mock!")
       elif int(numEntered) > 21 and numEntered < 28:
            print("That tells us that you got an E in your GCSE mock!")
       elif int(numEntered) > 29 and numEntered < 36:
            print("That tells us that you got a D in your GCSE mock!")
       elif int(numEntered) > 37 and numEntered < 44:
            print("That tells us that you got a C in your GCSE mock!") 
       elif int(numEntered) > 45 and numEntered < 52:
            print("That tells us that you got a B in your GCSE mock!")
       elif int(numEntered) > 53 and numEntered < 60:
            print("That tells us that you got an A in your GCSE mock!")
       elif int(numEntered) > 61 and numEntered <= 80:
            print("That tells us that you got an A* in your GCSE mock!")

else :
      print("Incorrect number! Try again!")

Python Fiddle

Python Cloud IDE