1. A method for analyzing exam-taking behavior and improving exam-taking skills, the method comprising: receiving video images, during a taking of an examination, from a multi-functional device configured to be worn by a student, of text or written content of an examination paper and/or an answer card, and wherein the examination paper and/or the answer card is a paper-based examination having an answer section for each of a plurality questions; obtaining a student answering sequence and timing to the examination paper and/or answer card from the video images of the text or written content of the examination paper and/or the answer card received from the multi-functional device, wherein the obtaining of the student answering sequence and timing to the examination paper and/or the answer card comprises: detecting a plurality of time intervals from the video images to determine when the student places an answer in the answer section for each of the plurality of questions of the paper-based examination by detecting hand movement and writing traces from the video images; and calculating each of the plurality of time intervals based on a time interval from a first frame and a last frame having hand movement and writing traces for each of the plurality of questions on the examination paper and/or the answer card; comparing the student answering sequence and timing with results from a previously computed statistical analysis of the examination paper and/or the answer card obtained from a plurality of students; identifying abnormalities in the student answering sequence and timing according to the comparison; and providing feedback to the student and/or a teacher when an abnormality in the student answering sequence and timing is identified.