I didn't try at all but eh:

Tryin to get fame by battlin the game, damn shame
His name 'konvex', cuz skill wise, we all out of his 'range!'
Smoke this bitch like grass, he won't last, his lyrics are ass
He's original? hardly...had to bite his fuckin name from math!
Like 'JFK', I deliver lyrical 'assination', this bitch is gonna be dead
Thinks he dope, but like this kid's sig says
...'It's all in the head!'
You tried for the council, i'm the reason you aint in the crew
He's dope? nope, just uses superior methods to 'kon' you!
Think your immortal, well yeah, at being wack by far
Hit you hard and leave him mo' spun then his avatar!

line 2: Konvex lens is used for people who can't see things far away
line 3: Konvex and concave figures, learn about this in math
line 5&6: JFK was assinated by being shot in the head, his sig says "it's all in the head" so i'll assinate him like JFK, it's all in the head the bullets, you get it, and also cuz ya he thinks he's dope but it's all in the head
line 7&8: Kon like con, his name is 'kon'-vex, also his memeber title says immortal, and his avatar is a disc spinning