You are under a lot of pressure, this anxiety often intereferes with memory and recall. Once your calm and relaxed, everything that you learnt would get back to you.
Divide the material you want to learn in chunks. While you are studying stay free from distractions. And practise deep breathing. Eat healthy and stay confident.
If you think you are unable to cope up with anxiety, talk to a trusted adult.
Health Tips
In case you feel the need. You can get audio consultation. Call and book an appointment.