Can you show your mom the results of the online test and ask if she will schedule you for a second opinion with another doctor who is knowledgeable about ADHD specifically? It could be that it’s not fully ADHD but executive functioning disorder/delays, but, either way, it is good to know so you can get help.
Also, try talking to your guidance counselor at school about it.
Penny
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism