If you are unhappy with your grade, please go back into the activity and make sure you have completed all tasks.
Complete any missing tasks, making sure to interact with all features, and complete the activity. This could increase the percentage score in your gradebook.
This video demonstrates how to complete activities: https://media.intostudy.com/video/upload/v1593188232/Central%20video%20gallery%20linked%20to%20VLEs/Student%20Videos/How%20to%20complete%20your%20elearning%20activities.mp4
If you are still unhappy, speak to your teacher and explain that you are unhappy with your grade. Your teacher will then take note of this and talk to you directly.