An eight-time national champion, Brooke-Smith finished second at the world championships in Belgium in 2019.
That’s brought injuries along the way and built the teenager’s resolve.
Brooke-Smith said: ‘I was seven when I went to my first world champs.
‘I qualified for the quarter-final, crashed out and got a concussion. Next year in Columbia, I made the final. So I was top eight in the world. I was in third, but crashed in the final.
‘Then 2019 is when I got second and then in my last world champs in 2022, this American takes me out and that’s it, my world champs done. So I think BMX made me mentally very strong.’
Brooke-Smith’s dad is Englishman Phil Brooke-Smith, who is a British BMX champion with his mother from Malawi.
Likewise, contracted under-21 players don’t count towards the 25-man squad total Pompey have to work within.