sugar of 115
could be "somewhat normal", depending on when you measured it. blood
sugar of 147 is not normal regardless of when you measured it.
Truely normal fasting is in the low 80s, however most doctors will allow up to about 99, 100 - 126 is prediabetic, and >126 is overt diabetes.
2 hours after eating
target should be close to fasting if your blood
sugar is normal, but always < 120, though some will allow < 140.