Is A level ucas points a combination of 2 AS grades ie C at but B A2 would only be 90 or is it 100 like states?

UCAS points are based on the final A-level grades, not a combination of AS grades. AS levels are not used in the calculation of UCAS points. A grade of C at A-level is worth 80 UCAS points, not 90. An A at A-level is worth 120 UCAS points, a B is worth 100, and so on.