Answer:
Realistically speaking, false
Step-by-step explanation:
You're always learning, but the definition of "mastering" anything depends on your school's standard of "mastery". It's either they believe you always progress or they believe a certain level of skill you have will make you a "master" of something. Just make the answer according to your school's discretion.
Note: Almost all traditional schools will consider the answer to this question as true.