Rule #1 is to never change ur answers on tests. Unless u are 100% sure don't change ur answers. They might be wrong but the regret is less. Endet latna lalshiw demo i always used to start ke kebadu subjects, used to study in the school lunch break lay, and always used to study atleast for 3 hours after i come home if I've the energy or I've test demo over 10 hours saltegha. I'm not saying do the same but I got good results doing those so I'm just sharing my experience. Kehulum demo doing questions will save u more time and it's very effective try to do as much questions as possible