1. A levels/GNVQ Advanced/NVQ 3
2. Certificate, Diploma, Degree (usually one, two or three years' university study respectively) - these are all undergraduate courses. Degree is a Bachelor's, with or without honours.
3. Postgraduate Certificate, Diploma and Degree. The degree will be a Master's.
UCAS points - you earn a set number per subject taken at A level, depending on the grade you get. Universities specify how many UCAS points you need in order to be eligible to study for a Bachelor's degree. The number of points depends on the university and course applied for.
Hope this helps.