Can bank providing me a student loan be my sponsor for uk visa for taking plab 1 and plab 2

Currently completed my intership will be employed soon with a job.Now i want to take plab1 and plab 2 from uk . But i have queries regarding my visa for that
Can bank providing me a student loan be my sponsor for this . I also have a family buisness under my mothers name how can she be my sponsor?