The basic cycle included six years of primary school and after passing special examinations, three years of intermediate school.[44] Another special examinations gained admittance to the non-compulsory secondary cycle (grades ten through twelve). Secondary students chose between a general (college preparatory) curriculum of humanities, mathematics, or the sciences: and a technical curriculum of agriculture, communications, or industry. Students could advance between grades only after they received satisfactory scores on standardized tests.[44]