after completed many task once my accuracy level is below 90%(almost 88%),I am not able to participate any task.I want to know,if there were any process for which I am again participate that task at below accuracy to recover the percentage of accuracy (i.e above 90%)

Hello tanmoycha ,

There are two reasons for this happening.

1. The accuracy percentage below which you can continue a task varies from task to task . may be your are performing a task which does not allows work once when your accuracy has dropped below the minimum required accuracy , in your case 90%(minimum) as said by you . these minimum accuracy % are set by crowdflower as demanded by the advertisers of the task .

2. You might have reached your maximum quota limit which is unlikely in your situation since you have stated that you are being void of doing tasks because of your accuracy % have been decreased .

you can recover your accuracy back only if you were permitted to do the tasks and there is no way you will be able to increase your accuracy if you were flagged .

The accuracy % will be set to 100% as and when new tasks come by and new lot of tasks appear . You can not set back the accuracy yourself .