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tiennm99
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Computes each student's max admission-block sum across 49 official 2017 blocks (A00-A11, B00-B08, C00-C20, D01-D15, restricted to subjects present in our DB — no Đức/Nhật languages). One row per student, sorted by their personal best, top 100. SQL note: SQLite's MAX(x,y,...) scalar returns NULL if ANY arg is NULL. Each block expression is wrapped in COALESCE(..., -1); NULLIF(..., -1) restores NULL only for students with zero computable blocks.