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Yes, you can appear for a compartment (supplementary) exam in Economics with the JAC board if you missed the original exam, provided you meet specific condition

Must have appeared in the Class 12 board exams in the same year (2025).

Must have failed in a maximum of two subjects (either due to absence or low marks).

Compartment form registration: June 2025 (through your school).

Last date to submit form: June 2025.

Exam window: July 2025.

Compartment results: August 2025.

Missing the Economics exam counts as failing that subject, which makes you eligible.