General

Also mp3 is awesome from 140-155 make sure to keep the monkeys at top and the anchor in the middle. With two 4 hour 2x cards I went from 140-158 in 8 hours. Good Luck!

thanks man

From 120 until level 140, you can train at Monster Park Extreme. These monsters have much more hp than normal monsters, but they reward the most experience in the game for those levels. Also, you can fight zakum twice a day. If you cant solo all of zakum, you can just kill the arms (they'll reward you a level or two).
If bored of Monster Park Extreme, doing the Magathia pq and grinding at the Roids stage will earn you decent exp. I wouldnt recommend doing this past 140.

At level 140 you can head over to either Dimensional Invasion pq or Evolution Lab. In the DI pq, you can join a party if you cant solo, and this rewards hefty experience. However, you can only do this pq 10 times a day. Once your maxed out on the number of attempts on the day, head over to Evo Lab and go into room 3 (room with mushrooms), you can grind here 3 times a day, 30min seshes each time.
If done correctly, completing zakum runs, DI runs, evo runs, and potentially Horntail runs (if you can kill), you should eventually reach level 165 in maybe a week or so (without 2x exp), and then you can head off into the final training place in the game.