When Class 12 improvement exam batch 2018 form will be out

Generally the applications are available in the month of September and in your case it would be September 2017 for 2018 exam. However, the dates may differ from state to state and board to board. So you have to keep a track of the dates. Also, it's generally a rule that the zone you had last appeared in 12th, you need to apply and take improvement from the same exam zone again.