i am scoring well in sectionals but somehow can't manage a good score in mocks. can you help?

1.Sectionals are a bit easier. 2. Mocks tend to give you sections of mixed difficulties so your score will normally fluctuate. Whereas in sectionals when you give 5 tests and 1 of them you score less you ignore that and see that the average performance is good but in a mock a difficult section needs tackling while maintaining other sections. 3. Give three sectionals back to back with 5 min break and see.

Same issue, would appreciate if someone elaborate well on this