Skool Daze Pokes
Infinite lines

To stop MR WACKER expelling ERIC after 10000 lines:

POKE 63931,201

No lines

To prevent teachers from giving lines to ERIC or anyone else:

POKE 30464,201

However, that won't prevent MR WACKER from giving ERIC 2000 lines during the 'special' playtimes (if EINSTEIN tells WACKER what ERIC's up to, or WACKER finds the pea-shooter on the fire escape). For that you need:

POKE 63468,0

One harmless side-effect of this POKE is that the lines total will be printed as '00' instead of '0' when WACKER delivers his 'TAKE 2000 LINES...' speech.

Super catapult

To extend the range of the catapult from 13 to N:

POKE 28773,N

However, this doesn't extend the 'hit zone' of the pellet (the portion of its flight where it can hit something). To change the hit zone from the last 7 stages of its flight to the last M stages (M=N-6 is a good choice):

POKE 28000,M+1

Walk through walls

To enable ERIC to walk through specific walls:

POKE 26233,0 (classroom walls, from the right side)
POKE 26328,0 (classroom walls, from the left side)
POKE 26320,0 (wall at top of right-hand staircase on middle floor)