Every student (and teacher) at some point doubts their ability to draw accurately. It will not be something that happens by magic, it is all down to practice. However, there are a vast amount of materials and techniques you can use to help you to learn how to put down marks while responding to what you are looking at or communicate an idea from your imagination.
I will be posting examples of exercises we have used in school but the following link suggests some drawing tasks for you to try
Please show us your drawings or ask your Art or DT teacher for more information or different drawing tasks to help you improve.