First your gonna wanna speed through notebooks 1 and 2. Next your gonna want to go to the left hall. After this open the faculty door and get the item if its useful (Bsoda dirty chalk eraser Ect.) But don't go through. After you get the item if your fast enough get out of the vision of null. In the version im playing on null is still based on sound like baldi unless he see's you. Then collect notebook 3.

After this try to get to the lunch room and get notebook 4 and collect the items.

I dont have any further help on the rest of the books because of RNG but i recommend getting dirty chalk erasers before getting the last book. I recommend going to the far right or far left exit as the last exitso you have more space to run away from null. Its like getting a head start. That's all the advice i have