C# Marking Everything As Serializiable How Do I Get Better At Studying? I Have Tried Everything. Make Que Cards, Rewrite Notes, Read Notes To Myself?

How do i get better at studying? i have tried everything. make que cards, rewrite notes, read notes to myself? - c# marking everything as serializiable

What should I do? Has anyone a good advice? I studied for about 16 hours on it last week for a mid-term and only one C. The day before I knew everything there is in this test. everything, but still a terrible point.