To apply for good grades discount for car insurance, is it necessary to send a school transcript immediately?

My parents are switching their auto insurance company and want me to apply for the good grades discount. I've researched that most insurance companies will only accept a 3.0 GPA and higher. The problem here is that I currently have a 2.7 from messing up last semester and wanted to make it up without my parents knowing. What I want to know is that will auto insurance companies allow me to apply for the good grades discount at any time or is it a one time deal. Thankyou!