CREATE TABLE table_203_638 (id DECIMAL, "score" DECIMAL, "2007" TEXT, "2008" TEXT, "2009" TEXT, "2010" TEXT, "2011" TEXT, "2012" TEXT, "2013" TEXT)

what is the number of students in 2011 that received a 1 ?
SELECT "2011" FROM table_203_638 WHERE "score" = 1
SELECT "2011" FROM "table_203_638" WHERE "score" = 1