If u have been studying for a while now, it's called burn out. It might happen when our brain feels tired. If u haven't studied demo it could be ur mind trying to protect you from the stress u about to feel. Enem yehone seat lay I was numb aff ena matric derese alderese, mnm aymeslegnm neber. Ena my brain knew I had to study but I didn't have the motivation cuz I didn't care anymore. keza I convinced my self to at least study for the sake of knowledge cuz UK matric mnm aymeslegm neber but after a couple of weeks, it went away berasu gn in ur case u don't have a couple of weeks so do what I did. If u dont feel ntn for the national exam, study to at least know what's in your text book. Ik it's hard cuz I've been through it too but UK, ur future doesnt care abt ur feelings. Sad truth. And remember to take some rest as well cuz burn out lihon ychlal. It's not just u, most of my friends have been through it this year ena it's normal. Take it easy on ur self demo😁 good luck :)