Yes, students can appear in a single subject for the Assam AHSEC 12th exam for the improvement of marks. For subjects involving practical, candidates have to appear in both theory and practical for improvement scheme.

Regarding Lower Marks in Improvement Exam:

There's always a chance of scoring lower in the improvement exam. However:

• Better Preparation: With focused studying and practice, you can aim to improve your score.
• Worst Case Scenario: Even if you score lower, your original marks will still be considered by most universities.

check all the details about AHSEC exam here

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dear student do not worried about your less mark because if you score more mark in your previous exam then your improvement mark is not counted and also if your not qualifying passing mark in your improvement exam then do not worried because board evaluate which ever is high mark in your mark sheet...

thank you all the best......