> For the complete documentation index, see [llms.txt](https://help.i-test.vn/i-test4u-huong-dan-su-dung-danh-cho-hoc-vien/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.i-test.vn/i-test4u-huong-dan-su-dung-danh-cho-hoc-vien/chuc-nang-chung.md).

# Chức năng chung

- [Đăng ký](https://help.i-test.vn/i-test4u-huong-dan-su-dung-danh-cho-hoc-vien/chuc-nang-chung/dang-ky.md)
- [Đăng nhập](https://help.i-test.vn/i-test4u-huong-dan-su-dung-danh-cho-hoc-vien/chuc-nang-chung/dang-nhap.md)
- [Quên mật khẩu](https://help.i-test.vn/i-test4u-huong-dan-su-dung-danh-cho-hoc-vien/chuc-nang-chung/quen-mat-khau.md)
- [Cập nhật thông tin tài khoản](https://help.i-test.vn/i-test4u-huong-dan-su-dung-danh-cho-hoc-vien/chuc-nang-chung/cap-nhat-thong-tin-tai-khoan.md)
- [Mua lượt sử dụng đề thi](https://help.i-test.vn/i-test4u-huong-dan-su-dung-danh-cho-hoc-vien/chuc-nang-chung/mua-luot-su-dung-de-thi.md)


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