confused.. What is the difference b/w GOOD NOON and GOOD AFTER NOON .?? even they mean the Same. O.o

Top position Good noon.. I m a student.. i love to do work hard.. i want to be on the top level in my college.. i want to be honour.. The thing is that i do hard work but i don't b able to come on top position. one thing i know that something is lack in ME.. i m unable to identyfy my weekness.. only one year is remaining of my graduation field that i want to be on the top position.. :)) "IF THERE IS ANY MISTAKE IN MY NOTEBOOK THEN PLS CORRECT ND SUGGEST ME HOW TO RECOGNISE MYSELF" :)

Hardly Leaning What are the daily life conversation phases that can be used in our life? pls help