Application question.

Please can someone explain page 36 of the student(tier4) application form.

K7 Initial application
K10 Extension application.

Just wanted to know if the initial application is meant for students who is just entering uk for studies. Because mom has been studying here for a few yrs, so does that mean she should use extension application. She was alittle confused and ticked initial application K7.

Also.....
The college she will be going to has said they have been assessed by the HO and is waiting for their sponsorship number. Does that sound good enough to you.

Please help.