An application for changing subject is a formal letter students write when they want to switch from one subject to another in school or college. Common reasons include difficulty in the current subject, lack of interest, or a better match with future goals.
Below are simple sample formats you can copy and edit.

Sample 1: Change Due to Difficulty in Subject
To,
The Principal
[School Name]
[School Address]
Date: [Write Date]
Subject: Application for changing subject
Respected Sir/Madam,
I am a student of Class [Class]. At the time of admission I chose [Current Subject], but I am finding it very difficult and am unable to continue with it. Kindly allow me to change from [Current Subject] to [New Subject].
I shall be very grateful for your kind permission.
Yours obediently,
[Your Name]
Class: [Class]
Roll No: [Number]
Sample 2: Change Due to Lack of Interest
To,
The Principal
[School/College Name]
Date: [Write Date]
Subject: Request for subject change
Respected Sir/Madam,
I selected [Current Subject] but I do not feel interested in it and want to study [New Subject] instead. Kindly grant me permission to change my subject.
Thanking you,
Yours obediently,
[Your Name]
Roll No: [Number]
Sample 3: Application by Parent for Subject Change
To,
The Principal
[School Name]
Date: [Write Date]
Subject: Application for changing subject of my child
Respected Sir/Madam,
My child [Student Name] is studying in Class [Class]. He/She took [Current Subject] by mistake and is not interested in it. Kindly allow a change to [New Subject].
Yours respectfully,
[Parent’s Name]
Sample 4: Simple Subject Change Request
To,
The Principal
[Institution Name]
Date: [Write Date]
Subject: Application for changing subject
Respected Sir/Madam,
I wish to change my subject from [Current] to [New]. Kindly grant me permission to do so.
I shall remain thankful to you.
Yours obediently,
[Your Name]
These samples for an application for changing subject can be customized before submitting.