Yes, you can surely give improvement exam for any one subject or more than one depending upon your satisfaction level.

You can apply directly to fill improvement form on official site of haryana board.

• Open the official website of Haryana Board.
• Search or click on the “What’s New”.
• You are at the " HBSE Improvement form for class 10\class 12“.
• Start filling the required details.
• Final, hit the submit button.
• You’re done !! You have successfully submitted the class 10th & 12th Improvement Form at Haryana Board’s Portal.