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An online tutorial service that allows you to study anytime, anywhere

Prologue Online Tutorial is an online learning application which offers a wide selection of high-quality tutorial video particularly for students in the junior and senior secondary sector (HKDSE) to browse.

1. csl customers benefit from exam tips exclusively
Junior to senior secondary (HKDSE) exam tips exclusive to csl customers including answering techniques, outline analysis and problem-solving skills.

2. Tutorials prepared by world-class educators covering Chinese, English and Maths subjects
Tutorial content covering exam tips, listening, oral and vocabulary application.

3. World-class educators help you prepare for exams
Educators range from 5** fresh high school graduates, PhD professors, university lecturers and former Examinations and Assessment Authority markers to master’s degree teachers

4. Expand your knowledge anytime, anywhere in the world with your own pace
Online courses are at your service 24/7. You can play, pause, rewind or fast-forward videos however you want. Simply jump right into whatever topic you need to brush up on.


Charge type Service charge
Month-to-month Rate: $59
Monthly Rate within Commitment Period: $39

* If you decide to terminate this service within the contract period, you must pay us the remaining balance of the service plan fee within the committed contract period.


How to use:

1. Enter Prologue  >   2. Choose subject  >   3. Watch tutorial video immediately
1. Enter Prologue   2. Choose subject   3. Watch tutorial video immediately

Ways to download
Please visit Google Play or the App Store and search for “Prologue”.


Terms and Conditions for Prologue:

  1. The Service is provided to csl customers who subscribed for mobile service plans with a data entitlement. To use the Service, you are required to subscribe and download the Prologue app from Google Play or App Store.
    1.1 Local Mobile Data for access the Service will be deducted from your Service Plan entitlement.
    1.2 Video quality may vary due to internet conditions, server speeds, network conditions, coverage, locations, the computer and device used, hardware, software, usage levels and other factors.
  2. For the provision of Service, you agree to let us share your mobile number used by the customer in accessing the Service to Prologue Limited.
  3. All content are provided by third parties, and we are not responsible or liable for the quality, nature, accuracy and usefulness of the content.
  4. The use and the provision of the Service are governed by the relevant terms and conditions of the Service by Prologue Limited ( and CSL Mobile Limited (, as amended from time to time. The customer shall be deemed to have agreed to and be bound by such terms and conditions of Service upon the downloading and opening of the Prologue.



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