17 year old sprint times - How much can I improve most likely?

Hello! So this is my first year I have joined the track team for my school and I was just curious how well my 100m is and how much I will be able to improve? I know there is no certain answers but I just want an idea of how much better most people. Keep in mind I have never been in any sports and I don't work out.

My 100m when I first joined was a 12.85s and now it is a 12.27s. I know it is not amazing but I am just curious at how much you guys think I can improve
200m: First tried (26.5)
Now (25.31)
400m: First tried (61)
Now (58.5)

Weight: 123lbs
Height: 5'8"
Age: 17

Thank you!
 
Forgot to mention, I am a male not a female
 
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