skipped school today

so i just finished my end of the year exam yesterday (21st) and it says on the schedule that theres supposed to be another big test for our graduate thing on the 24th. naturally i thought that the gap (22 and 23) means theres no school because COME ON we just finished a test and we get no break after? and it turns out i was wrong. ive only found that out last night when i checked my phone just about to sleep. i already told my mom before that there wont be any school today but when it happens to be that i was wrong i was too sleepy to let her know. today i skipped school and it turns out my teacher asked my mother why i wasnt at school and she said that i said there was no school today but before i found this out i already texted my teacher saying i wont attend bcs of a headache. now he knows im lying.