Probability and Linear Algebra 101 by @OKSoFar
❶ Before you hit 'start', please keep a pen and a paper ready, some questions may require you to work out a solution. ❷ As soon as you answer a question, timer for the next question starts. So, DO NOT spend time on the explanation, you can look it up anytime later using the 'lamp' button. ❸ Channel @OKSoFar has a list of more such quizzes, do check them out.