In evans tries an o level …

This is a very very strategic answer that has many components. Firstly, Evans had planned his escape meticulously with some of his accomplices. The German teacher was one of the first people who helped fabricate the plan. The real invigilator was gagged and tied up at his home to prevent his presence at the exam and was replaced by one of Evans friends. This 'invigilator' wore two pairs of the same clothes and during the test, aided evans to change into the extra pair. While Evans was getting disguised, a call from the exam board was made for a correction while did not truly exist. The correction provided the name of the hotel that Evans was meant to go to and the roll number was the address according to latitude. After the disguise, the 'invigilator' was led out and Evans stayed back and poured pigs blood all over himself and acted like he was the real invigilator who had been attacked. He insisted on helping the police as he knew the place Evans was going to and led the police out. One they left, Evans quietly escaped from the prison