Which type of wall would make the best soundproofing for room? a. 1. 0 centimeter thick glass b. Two layers of 0. 5 centimeter thick glass with 0. 5 centimeters of air between them c. Two layers of 0. 5 centimeter thick glass with 0. 3 centimeters of vacuum between them d. 1. 0 centimeter thick steel.

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.