Each competition maintains its own specific timings but this page gives an overview of the academic year.
|Bebras / OUCC||PCTC||BIO|
|September||PCTC R0 Practice Challenge released (optional)|
|November||Round 1 runs in the first half of November, sat at schools|
|December||Round 1 opens mid December, sat at schools|
|January||Round 1 (teams of 2) opens end of January for a fortnight, sat at schools||Round 1 closes mid January, sat at schools|
|February||OUCC Round 1 runs early February||Round 1 closes early February|
|March||Round 1 runs towards the end of February, sat at schools, for qualifiers from Bebras. A second round for the top 20 in each age group is in mid-March.||Round 2 (teams of 3) opens mid March for a fortnight, sat at schools||The national finals (by invitation) are held at Trinity College, Cambridge over a residential weekend to determine the four UK representatives for the next IOI.|