It depends on the type of CSCS Card that you require:
Green Labourer Card: You must complete an IOSH Working Safely Course or a construction related NVQ Level 1
Blue Skilled Worker Card: You must hold an NVQ Level 2 in your chosen trade.
Gold CSCS Card: You must hold an NVQ Level 3 in your chosen trade or in construction supervision.
Apprentice Card: You must be enrolled onto a recognised apprenticeship.
Trainee Card: You must be enrolled onto a construction related NVQ Level 2 or 3.
Yellow Visitor Card: No previous qualifications are required.