I am a regular examiner of CAIE - Cambridge Assessment International Examination for IGCSE and AS, A levels - Chemistry.
As an examiner of such reputed institution in UK , I educate students with the perspective of an examiner too.
The students get a deep insight on 1. What kind of questions they could face in the exam. 2. What a student should look for in a question before answering. 3. What an examiner looks for in an answer while evaluating. 4. How to frame an answer to score maximum marks.
This perspective of a teacher and an examiner guides them to improve their grades.