Registered mail is the slowest of all mailing methods, because every time you pass a site, you will hang a number, so it is a waste of time. The better way is that ems can arrive in the same city within two days, but the price is more expensive, more than 20. You can also check some local express companies online, which are faster and cheaper than ems. Writing a thesis should be about 10 yuan. No registered mail ~ ~ ~