I'm join the classes for bank exams preparation.
Many students gets to the top in my state even without coaching.
If the students is able to follow teacher's explanations and if he/she continue to revised what is learn already than it is for sure the particular students will get good marks.
Depending on students interest in study, Spending more time with books, asking doubts in the class are some with makes a students brilliant.
For the great work and education join the classes.
Read next
From @sumi18