The videos speaks about the importance of marking scheme and common errors committed by students due to which they lose marks, although they think they have attempted right.
Marking scheme assigns a fixed proportion of the allotted marks to particular knowledge, understanding and/or skill.
While solving a problem, writing formula, substituting values in the formula, simplification, application of BODMAS rule to simplify, Writing proven statements as reasons are essential parts of the solution that fetch marks. Students can make a mistake in any of the steps mentioned. A small mistake in any of the steps could lead to deduction of marks. Example, a mistake as minor as assigning the wrong sign to a numerical while substitution or simplification might give a wrong answer.