Will the Remaining Package Quota in a Given Month Be Carried over to the Following Month?

No.

Monthly reset rules for resource packages:

Reset by subscription period means that after a resource package is purchased, its quota will reset at 24:00:00 on the same day (the purchase day) of each month. For example, after you purchase an Internet outbound traffic package of 2 TB (each month) for 6 months on April 15, you will have 2 TB Internet outbound traffic available to use from April 15 to 24:00:00 of May 15. Then, at 00:00:00 on May 16, another 2 TB outbound Internet traffic will be allocated to you, so you can use this 2 TB traffic between 00:00:00 on May 16 and 24:00:00 on June 15. The following months follow the same rule until the purchased package expires. If you do not use up your quota in a given month, the remaining quota will not be carried over to the following month. The quota resets every month.

Note that if you purchase a resource package on January 28, the quota will reset at 00:00:00 on March 1 because there are only 28 days in February. Also, in the months following March, the quota still resets on the first day of a given month.