In a two-slit experiment, monochromatic coherent light of wavelength 600 nm passes through a pair of slits separated by 2. 20 × 10-5 m. At what angle away from the centerline does the second dark fringe occur?.

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

Number 3 is the logical, go-to answer for the classical school of thought as they strongly believe that an individual commits a crime of their own free will and fully understands the  consequences, making them liable to whatever punishment is dealt to them. 

Maybe because he failed the classes or is very accelerated.