Hello,
You can go through previous year paper for AHSEC for all the subjects in order to get acquainted with paper pattern, important topics, marking scheme and other relevant details by visiting the link provided below;
https://school.careers360.com/articles/ahsec-question-papers
For the syllabus and marks weigtage, you caan go through https://school.careers360.com/articles/assam-ahsec-syllabus
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