add refund logic and fix books inventory logic

app/Views/index.php

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                     <h1>Faith and Knowledge Hand in Hand</h1>
-                    <p>Our Sunday School program (Grades 1-9, Youth) is evenly divided between Islamic Studies in English—exploring topics about Allah, Islamic values, Muslim life and lessons from the Prophets—and Quran/Arabic studies focused on recitation, memorization and language. This balanced approach nurtures both understanding and practice of Islam.</p>
+                    <p>Our Sunday School program (Grades 1-10, Youth) is evenly divided between Islamic Studies in English—exploring topics about Allah, Islamic values, Muslim life and lessons from the Prophets—and Quran/Arabic studies focused on recitation, memorization and language. This balanced approach nurtures both understanding and practice of Islam.</p>
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                         <h1 class="mb-4">Our Curriculum and Grade Structure</h1>
                         <p>Our program spans nine structured grade levels, each building upon the previous year's knowledge to ensure a solid foundation in faith, character, and Islamic learning.</p>
-                        <p>Upon completing the 9th grade, students transition into our three-year Youth Program, which emphasizes deeper community engagement, personal development and practical application of Islamic principles. Participation in the Youth Program requires students to be at least 15 years old, ensuring they are mature enough to benefit from its advanced content.</p>
-                        <p>Starting this academic year, children must be at least 6 years old by 09-01-2025 to enroll in Grade 1. For younger learners, we are pleased to offer our newly established Kindergarten class, welcoming children who are at least 5 years old by 12-31-2025. This early education program is designed to introduce young minds to the basics of Islamic teachings in a warm, age-appropriate environment.</p>
+                        <p>Upon completing the 10th grade, students transition into our two-year Youth Program, which emphasizes deeper community engagement, personal development and practical application of Islamic principles. Participation in the Youth Program requires students to be at least 16 years old, ensuring they are mature enough to benefit from its advanced content.</p>
+                        <p>Starting this academic year, children must be at least 6 years old by 09-01-2026 to enroll in Grade 1. For younger learners, we are pleased to offer our newly established Kindergarten class, welcoming children who are at least 5 years old by 12-31-2026. This early education program is designed to introduce young minds to the basics of Islamic teachings in a warm, age-appropriate environment.</p>
                         <a class="btn btn-success py-3 px-5 mt-3" href="/register">Get Started Now<i class="fa fa-arrow-right ms-2"></i></a>
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