SELECT AVG("Grid") FROM table_52587 WHERE "Constructor" = 'brm' AND "Laps" < '63'
What is the average grid with brm and under 63 laps?
CREATE TABLE table_52587 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)