Hi Assan,
I am sorry to have to tell you that your teacher of Aviation Legislation is talking rubbish. He/she clearly has little grasp of the Part 66 requirements, and does not understand the meaning of the terms "OJT".
You have now managed to get the admission that the "Institute" is not Part 147-approved. You are wasting your time and money with these people; running a 4-year course to pass the Modules is absurd, and what they are telling you about the requirements is nonsense.
As a non-approved organisation, this Institute falls outside the control of EASA and/or a National Aviation Authority. They can do what they like and there is little that their victims can do about it except walk away.
I recommend you find a genuine Part 147-approved training organisation and discuss it with them.