Table: race_results_56
Columns: year
entrant
chassis
engine
points

Question: Which year had a Cosworth V8 engine and 12 points?
SQL: SELECT "year" FROM race_results_56 WHERE "points" = 12 AND "engine" = 'cosworth v8'

Question: How many points did the ATS Wheels entrant with an ATS D2 chassis have?
SQL: SELECT "points" FROM race_results_56 WHERE "entrant" = 'ats wheels' AND "chassis" = 'ats d2'