In a well written question, there will usually be two choices left after mark out. This interrogation will get you into the memory banks where the knowledge is stored. Anxiety and fatigue cause students to miss question for which they know the answer. Both conditions show up as a rather specific pattern of errors which can be corrected once the reasons are known. There are basically two types of error patterns caused by anxiety.
Many students are very anxious when they begin an examination.
Gradually, the student becomes more composed and the anxiety diminishes. An error string is a cluster of three or more errors in a row usually caused when a student gets a surge of adrenalin. Since a sudden surge of adrenaline is not conducive to mental concentration, it is likely that errors will be made in the questions that follow. This is done by taking a few questions from an old examination without the foils. Find a quiet place and practice reading and rephrasing the questions.