About 4 Download packages: 1Week, 1Month, 3Months and 6Months. The package only limit valid time, no limit quantity. You can buy product connect with Membership to access download page, require login as a member. Works fine when you are logged in as a member
Download packages: unlimited ebook number, only difference valid of time.

Always require an account registration, you can do this at the same time when make a payment by filling out user name and password.

Yes! When you use real email to sign up for an account, that email will receive a confirmation when the account upgrade is successful. In addition, when you need support from the admin, it is easy to determine the status of your account.

You can send a message at the Contact page, if you are already a paid member, log in to contact us via a separate form for paid members (also at the contact page)

Normally the system will automatically upgrade members, but there are probabilities of error. If you have successful payment and you are still logged in as a free member after 10 minutes, the best way is to send an email to the receive payment email (nlonghung@yahoo.com) included information: transaction ID, username, email. The administrator will upgrade your account as soon as possible.
Forgive if this is the rare case!

The Cambridge Science, Math, and Global English secondary level are still stored in the same directory as the primary level.

There is a folder “Math-Science-Social-Language Arts” only store e-books belong this category

No, e-book file isn’t stamped (no watermark) and can be printable after being downloaded

– Before logging in and paying for membership upgrades, you need to know that there are a lot of documents you can download or use online (which is what you see / hear when you are not a member). Please use the search feature when downloading as well as browsing the site to get the most results.
However, there are no available guarantees for all that you are looking for. So please consider carefully before making payment so you don’t have to complain later.
– The following note should be emphasized: The above resources are classified into 3 functional groups:
1-Online (Use online); 2-Download (Downloadable) and 3-Projector (use flip book online but with clean content, no stamp, no watermark)
– Because these 3 functional subgroups are independent, it is impossible to guarantee the same data in all 3 groups at the same time. The update speed is different so the number will increase but not evenly.
– If you still cannot find what you are looking for, please send an administrator support request, for instructions on how to search or update manually on a specific request.