The criteria you mention are only if there is over subscription
"Only girls and boys who are deemed capable of following an education leading to the higher grades of GCSE in a full range of National Curriculum subjects are eligible to be considered for admission to the school. The Governors will judge whether a candidate fulfils these requirements by reference to tests to be taken at the school. Please Note: The school will be oversubscribed once more than 180 candidates score at least 70 out of 80 on the Non Verbal Reasoning (NVR) test."
The way I read it you take the test they apply following criteria to those who have passed.
" 1. Applicants who are relevant looked after children. [See footnote 1]
2. Those who live in the following postcode areas: [See footnote 2]
E2, E4, E5, E8, E9, E17
EN1, EN2, EN3, EN4, EN5 Sectors 1, 2, 4, 5, EN8 Sectors 7, 8, 9
N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14, N15, N16, N17, N18, N19, N20, N21, N22
3. A maximum of 20 students who show exceptional musical talent and achievement provided that, on the evidence shown by achievement in the entrance tests, they are also capable of maintaining the academic progress expected of the rest of the Latymer intake; evidence of exceptional musical talent on any instrument or instruments (including voice) is accepted. As a guideline a pupil should have achieved at least Grade 5 distinction level, but this will depend on instrument as well as previous opportunity and experience. Consideration will be given to candidates without that level of qualification but who otherwise show evidence of exceptional musical talent and achievement. Candidates may be asked to attend auditions
4. The 160 candidates who, on evidence of tests show the highest level of academic potential.
5. In either of the categories 3 and 4 above, where two or more candidates have the same total score the following order of priority will be applied.
- Test score in first round test taken by the applicants
- Test score in second round tests taken by the top 500 in first round test
Footnote 1: "Relevant looked after child" means a child who is looked after by a local authority in accordance with section 22 of the Children Act 1989 at the time an application for his/her admission to the school is made, and who the local authority has confirmed will still be looked after at the time when he/she is admitted to the school."
Footnote 2: The order of this list is alphabetical. There is no preference order within it.