Planning mag enroll sa med school

I have questions lang po. 1. Kelangan ba talagang mag all nighter pag nasa med school? 2. Madami bang practical exams/ demo? Mejo mahiyain kasi ako magtalk sa harap ng madaming tao? 3. May medschool ba na hindi tight and schedule? 4. Is it worth wasting another 4 years? Maraming salamat po