They can select, compare and evaluate appropriate problem-solving strategies for dealing with complex problems related to these models. Students at this level can work strategically using broad, well-developed thinking and reasoning skills, appropriate linked representations, symbolic and formal characterisations, and insight pertaining to these situations. In Mexico 0.7% of students reach the PISA mathematics Level 5 or higher, compared with 13% on average across OECD countries (C20 countries average 10.3 %, countries with simi lar GDP per capita average 4.9%).