Any single chances i cud join Fiorello H. LaGuardia highschool?

So today i got my 7th grade report card which was a 81 avg as final and high schools look at this grade. now someone told me to quit trying because 81 is not acceptable but others told me to get a high grade at SHSAT and do well at the audition. Can someone help me please and tell me if i have any chance to still attend this school. I want to get in it badly. Thank you.