Genuine question regarding the invigilators

Like plzz be serious, are inviglators actually like ACTUALLY not allowed to help candidates?! Like for the maths paper, my friend told me that one of the invigilators helped them and the day b4 maths, in chem another one of my friends who was sitting literally next to me, I FRKING SAW ONE OF THE INVIGILATORS GIVING HIM ANSWERS!!!????!?!? Tho me friend for the chem paper told me he thought the invigilator was giving the wrong answers cuz the invilator didn't look like they knew chem