var j number
begin
dbms_job.submit
(
:j,
'begin
SYS.DBMS_UTILITY.ANALYZE_SCHEMA(''TEST1'',''COMPUTE'');
SYS.DBMS_UTILITY.ANALYZE_SCHEMA(''TEST2'',''COMPUTE'');
end;',
SYSDATE,
'NEXT_DAY(trunc(sysdate),''SATURDAY'')+1/12'
);
COMMIT;
end;

... or just submit two jobs, of course.

By the way you should be using DBMS_STATS, not DBMS_UTILITY