Very attainable. BUT you need to have a very STRONG reason.
Willing to make the sacrifice for practice - 30 min to start, 1 hour or more daily later....You may be distracted by ECs ( extracurricular) and your beautiful date.
You need to BUILD a very strong RPM
https://www.youtube.com/watch?v=n_yV3KBzxx4
I can help remotely when you're stuck later....
START NOW!
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RARE Exception --- Grade 8 in 4 years !!
https://forums.abrsm.org/?showtopic=16770&page=2
you need to find a professional and very experienced piano teacher. e.g. Professor in Music / Piano ....Tell them your target before you start and how much time you can commit daily for practice.