welcome!

App subscription:
You can subscribe for access to the full list of Math lessons.
Payment will be charged to iTunes Account at confirmation of purchase.
You will be able to do all exercises for the duration of the subscription.
Subscription automatically renews for the same price and duration period as the original “one week”/”one month”/”one year” package unless auto-renew is turned off at least 24-hours before the end of the current period.
Account will be charged for renewal within 24-hours prior to the end of the current period at the cost of the chosen package (weekly, monthly or yearly package).
Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s iTunes Account Settings after purchase.
No cancellation of the current subscription is allowed during active subscription period.
You may cancel a subscription during its free trial period via the subscription setting though your iTunes account. This must be done 24 hours before the end of the subscription period to avoid being charged. Please visit: http://support.apple.com/kb/ht4098 for more information.
You may turn off the auto-renewal of your subscription via your iTunes Account Settings. However, you are not able to cancel the current subscription during its active period.
Any unused portion of free-trial period, will be forfeited when the user purchases an app subscription.

Links to our Terms of Service and Privacy Policy can be found below.

Privacy Policy: http://www.heima1688.com/privacypolicy/
Terms of use: http://www.heima1688.com/service/

* Prices are equal to the value that “Apple’s App Store Pricing Matrix” determines as the equivalent of the subscription price in $ USD

It is a software service provided by junhua zheng. These Terms of Service (“Terms of Service”) are the primary agreement between you and junhua zheng regarding your (“you” or “users”) access and use documentation and other services provided by junhua zheng (“Services”) .

Before accepting this agreement, please read all the contents carefully. If you cannot accurately understand or disagree with any of the contents of this agreement, please do not follow up. By clicking on the confirmation, actual purchase or use of the services provided by junhua zheng, you have read and fully understand the contents of this agreement, and have agreed with junhua zheng to use or order the corresponding products and / or services, and Agree to accept all the contents of this agreement and be bound by it.

In particular, you are reminded that you are concerned about the terms of this agreement regarding restrictions, exemptions from junhua zheng, restrictions on the rights of users, the determination of violations/defaults, and the choice of jurisdictional courts. The foregoing may be bold and/or Underlined to alert you.

Due to the rapid development of the Internet industry, these Terms of Service do not fully cover and cover all of your rights and obligations with junhua zheng, and existing agreements cannot guarantee full compliance with future development needs. Therefore, you agree that junhua zheng reserves the right to make any modifications and additions to these Terms of Service from time to time and to make them public. Normally (for example, when modifications or additions are required to meet applicable legal requirements), changes to the Terms of Service, Privacy Policy or Rules will take effect immediately upon publication or on the effective date of the regulations. Your continued access to and use of the junhua zheng documentation constitutes your acceptance of the revised Terms of Service. Otherwise, you have the right to terminate the Terms of Service by stopping access to the junhua zheng document and refusing to use the service, deleting your information and account on the junhua zheng document.

If you represent an organization other than your personal registration, login, and/or other services, you will be deemed to be fully authorized to act on behalf of the organization to agree to the modifications and additions to these Terms of Service and the Terms of Service from time to time.

1. Service content
“Products and/or Services” in these Terms means that the junhua zheng documentation provides you with the services displayed on the http://www.heima1688.com website (the official website of the document), the specific service content is used or ordered by you. The content shall prevail.

Depending on the actual needs and other services provided by junhua zheng from time to time, junhua zheng may enter into other agreements with you. In the meantime, even if no other agreement is signed, your specific service using the junhua zheng document will be deemed to be your consent to junhua zheng’s request for such specific services. In the event of a conflict between the other agreement and this clause, the other agreement shall prevail, subject to the conflict and to the specific matter of the agreement.