Ok i recruited 4 people for the experiment and found 2 pieces of the Daedalus puzzle, but now i'm a bit stuck... I don't know where to find 2 more people and i can't do anything at the Church collage. I think i need to find something at the garden but i just don't see it.

... Random Number Generator (RNG). How does it work?

In any case, put 99 on the zero, then leave the % sign on 1-26, and for 27 to the end put zero if I remember correctly.

I have to check up on every student in the experiment if someone among them is actually pulling off the pranks around Oxford. I went into Helena's room. Searched it thoroughly. And then Charlie's and Harvey's too. All three floors. I also made a small device that has to be put in the gym in order for the culprit to be caught but Sam keeps telling she needs to do that by nighttime. What do I do next?

Did you take the camera from Helena's room (near the computer)? You'll need it to take pictures in the gym when using the device....otherwise, it might be a number of things you forgot to do to end the chapter...is the dorms the only place written in golden on the map? Also, you know you can use space to show hotspots, it might help if you missing some item

Yes, I took the camera. The only spots on the map that are not greyed out are the Edmund Hall, The Neurobiology Institute and the Church where the second Daedalus riddle takes place (I finished the riddle part for that chapter therefore this place gets excluded). The other place that I searched was Linkweller's office. But there isn't anything significant.

after exploring the rooms your are suppsed to bump in some lady that gives u a cellphone??

There is a door sign outside hiding next to the main door to the house, check it out then go to the garage. After that, go inside the house and you will see the lady.