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I would suggest getting more Lance Weapons. They are the key to cracking the AV13 wall.
Otherwise, knowing a basic concept will help a ton: Necrons have a kill radius of 24inches. If you have limit the amount of the opponents army that he can get in range of 24", you'll have a huge leg up. Use your speed. Don't rush it. Play conservatively, it will help.
Also, know that Quantum Shielding only is up until they take a penetrating hit. So that means if you hit them with a Lance, then your ST6 shooting will S H R E D the vehicle after.
Anyways, good luck!