What is the highest pts after 1952 with connaught type a?
CREATE TABLE "complete_world_championship_formula_one_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "pts" real
);
SELECT MAX("pts") FROM "complete_world_championship_formula_one_" WHERE "year">1952 AND "chassis"='connaught type a';