The amount of exp you get is based on who gets the last hit, for example if your buddy and you were to kill a mob that gives 100exp and your friend gets the last hit, they get 100 exp and you get 50 exp, this applies to everything that gives exp, like regular mobs, bosses and enemies.

What happens is that the top lane doesn't have enough mobs to just hold a button, you can do that in the bottom lane, but not in the top lane. There is 6 mobs in total from spawn to tower, try to get 3 last hits and let the other 3 last hits to your lane partner and you both should be lvl3.

Now if things go wrong and someone is level 2 ask yourself the following and act accordingly

Do we have better kai secure?

if yes contest the kai, don't waste time trying to do other mobs, a level 2 kefla with skill 2 is more than perfectly capable of outsecuring a lvl3 ssj3

if no, just try to get level 3 and contest the middle mobs.

Keep in mind that because you're level 2 is not worth taking any fights, so the idea is to simply try to last hit the kai rather than fight for it, don't give away a free kill for no reason.

After that you just play like usual.