You can use Topcem Premix or Mapecem 102 to level your concrete slab. If you have freeze/thaw cycles in your area, substitute the mixing water with Planicrete AC for Topcem Premix, or use Mapecem 202.
No. Self-leveling products are recommended for interior applications only. You can apply a concrete repair mortar instead, such as Topcem Premix or Mapecem 102.