Top is used with these nouns as the subject:
turnover

Top is used with these nouns as the object:
bill, chart, cheese, hill, list, per cent, record

be
come
She came top in the exams.

in
All the doctors here are top in their field.
She was top in English. (BrE)

of
He was top of his class.

Top is used with these nouns:
accolade, adviser, aide, amateur, athlete, award, barrister, bracket, branch, brand, button, candidate, chef, choice, coach, coat, commander, competitor, contender, copy, corner, deck, designer, destination, diplomat, division, dog, drawer, economist, edge, editor, employer, end, envoy, executive, exporter, flat, floor, footballer, form, gear, goalkeeper, golfer, grade, gymnast, half, hat, honour, hotel, industrialist, jaw, job, jockey, journalist, lawyer, layer, leader, leadership, league, left, level, lid, lip, management, manager, manufacturer, mark, model, movie, negotiator, nightclub, note, official, orchestra, performer, personality, photographer, player, pocket, portion, position, priority, prize, producer, professional, prospect, psychiatrist, quality, rail, rank, rate, rating, referee, restaurant, retailer, rival, row, runner, salary, salon, scientist, score, seed, shape, sheet, shelf, soap opera, soil, specialist, speed, spin, spot, spy, stair, step, storey, story, supermarket, surgeon, swimmer, talent, third, tooth, university, venue, window