Aio my mom 'forgets' to wake me up

I usually wake up on my own. I have my alarm and my routine but sometimes when it's a hard week I'll sleep through all my alarms which obviously makes me late for school. My mom usually checks up on me but never wakes me up for reasons I cannot for the life of me figure out. Like I'll be 30 mins past my wake up time and when I do wake up that is on my own I can't go to school the way I usually do. I ask my mom why she didn't wake me up and she tells me she did. Yk how she wakes me up? She takes a few steps into my room and coughs. Like girl that's not working on a tired teen come and shake me. I think she's doing this to avoid dropping me to school and mind u she doesn't even drop the whole way she only drops me off till the nearest public transport so if I wake up late I miss everything. Today I had a really tiring exam I came home and fell asleep. I woke up at 4pm... Obviously I missed lunch and I don't like having lunch at a later time and I've told my mom multiple times to wake me up if I'm naping but she never does. Atp idk why I even trust her? Like ik she's gonna avoid waking me up no matter what. Y'all got any tricks to wake up when u sleep through your alarm?