I need help with two of the yellow Comet levels. PLEEEEAAAAASE tell me..

Ok, first of all, Sonja's level:
Here you need to station your artilleries and rockets toching the mountains, BUT be careful not to loose these units to the enemy mechs or her distance weapons. It is best to place a Recon unit right behind some rockets or beside them, o you can see as much as possible. Also have some Mechs to clear out Lash's mechs.
WHATEVER HAPPENS, DON'T LOOSE YOUR ROCKETS!!!!!
The tanks up top should stay on the cities and leave the Rocket unit on HQ, or viceversa. Good luck

Now for Kanbei's mission:
Start off by arranging your units parallel to the laser beams, like a square. Send an artillery and a Mdtank to the right to kill that laser, the other laser can be destroyed by 2 shots of your rockets.
Start off by sending those units to destroy the laser and the box formation. After the lasers fire, get rid of the pests that are on your way and move forward, staying out of laser range. As soon as you reach the bridge, you should have destroyed both lasers. Now weaken the enemy tanks, you don't have to kill them. As soon as possible, place 1 Mdtank on an allied city, so it isn't captured, then, simply shoot out the mechs and infantry and you should be fine. Watch out for the enemy rockets though, they are anoying.

Good luck, hope this helps. It pretty much works on both campaigns.

For the mission with the cities, get rid of the lasers as quickly as you can and stick a tank on top of one of the cities.