That is a tricky one, but you can use the expression to convey "also" or "as well." For instance: "I really enjoy playing tennis, so too does my brother." A sentence like this would more commonly be phrased as "I really enjoy tennis and my brother does also/as well." To express the example you gave differently, you could say "School environment may present difficult social situations, but the real world does as well and children must learn to navigate these on their own."