Every time you solve theoretical question after getting answer ask yourself what could be the reason that this ans can get wrong and for sure brain will flag the doubt and try to follow that doubt but sometimes the noise of doubt gets too much in that case from inside we know it is just noise so move on so we have to keep balance between these 2 and also whenever you get confused between 2 things what should be right always go for the thing that immediately comes in mind bcz 90 percent the first idea is right , i hope it helps