Bridge Exercises offers tons of declarer play exercises for players of all skill levels to practice playing skills.
Level evaluation:
one star: Winning ratio less than 50%
two star: Winning ratio more than 50% and leas than 60%
three star: Winning ratio more than 60% and leas than 70%
three star: Winning ratio more than 70% and leas than 80%
five star: Winning ratio more than 80%
UI information:
Total played hands: total hands you have played.
Contract made: total hands you make the contract.
Contract down: total hands the contract is down.
Winning ratio: total hands you make the contract/total hands you have played.
Functions:
Solution: show you one of the best plays of the hand,
Replay: you can replay the hand, but number of total played hands will not include the replayed hands.

A good bridge declarer relies on a variety of skills, strategies and techniques, Bridge workbook help you practice more.
Tips for Bridge Exercises
Don't play to the first trick too quickly. Force yourself to stop and think.
Concentrate on the opening lead for a few seconds so you'll remember it later. Decide what it tells you about the leader's length or strength in that suit.
Review the bidding. If one of your opponents has bid, try to come up with a general picture of his point-count and his length in the suit bid.
Always Count your losers and winners.