After going through the grind on the first day of his Test debut against West Indies here Tuesday, India's fast bowler Varun Aaron said he needs to work hard to get wickets at the top level.

Varun generated good pace and bounce from the wicket, hitting the deck regularly at more than 140 kmph, but often strayed in line. He went wicketless, bowling 16 overs in four spells that cost 47 runs.