If i tilt the bus, does the centre of gravity point shift?

Position of centre of gravity for an object changes, only if the mass is redistributed. Eg: you lift your school bag filled with books above your head, the c.g. of your body moves upwards.

So yes... if you tilt the bus, the position does change. To understand, compare the position of the c.g. of a rectangle when resting on a floor. The c.g. is still at the centre of the rectangle, where the diagonals meet. But the actual c.g. position relative to the floor, whether the rectangle lies on the width or the length of the rectangle... is different.

Author of several O-level Science guide books (my profile pic). My forte is tutoring O-level sciences (Chemistry, Physics, Biology). Telegram Messenger: @ChillXsg Note that only my tuition students have the privilege to direct message questions, to clarify.

Edited the above answer. Initially read you comment as: if I hit the bus... lol

Ahhh i see. No worries ty