The "AA" tournament, which will run until October 6, is for the larger schools, with Tauranga Girls' College and Tauranga Boys' College making it into the nationals.
There will be a total of 268 basketball games played, featuring 800 players from 69 teams during the competition.
Te Wharekura o Mauao deputy principal and basketball coach Teimana Bennett said the school had been working on their basketball programme for about seven years, which was seeing results particularly in the growth of numbers and the development of the players.
He said in the school's first year at the nationals last year their focus was to gain experience.
"Our second, we would love to aim for top eight this year coming around, and looking to strive for higher than that most probably next year," Bennett said.
"A top eight would be credible."
He said basketball was a well-represented sport in the Western Bay and making the nationals was a great achievement.
Western Bay Schools qualified for 2018 Schick Championships:
A Secondary Schools
Te Kura Kokiri (A Girls)
Te Wharekura o Mauao (A Girls)
Waihi College (A Boys)
AA Secondary Schools
Tauranga Boys' College (AA Boys)
Tauranga Girls' College (AA Girls)