If you get a 3.95 GPA your first semester can graduate summa cum laude?

No, a single semester GPA of 3.95, even though excellent, is not enough to guarantee summa cum laude graduation. Summa cum laude requires a very high GPA *across all semesters* of your undergraduate education. The exact GPA needed varies by university and sometimes even by department. A 3.95 for one semester is a great start, but you'd need to maintain a similarly high GPA throughout your entire college career to achieve summa cum laude.