Difficult to predict

While checking across previous years results I found a student who scored 59/100 in 2017 had gotten 2201 rank and other student in same year had got 5038 rank for 53/100 meanwhile other student who scored 50/100 in 2018 has got 175th rank and one more guy had got 316th rank for 48/100 in 2018. It not only depends on us but also on others that how many has scored more than us.