Courses. Full-time Ph.D. candidates typically take advanced courses during their first 2-3 years of study. The number of course credits required to get a Ph.D. may vary widely, depending on the university's semester or quarter schedule and the doctoral program.tudents must first take advanced courses in their field for a few years, followed by a set of comprehensive exams. After this is accomplished, Ph.D. students produce a dissertation project, which can vary in its time to completion.
A Tween is 11-12 years old. A pre-TWEEN is 9-10 years old. Ten year olds are immature, so they are not classified as tweens. Eleven year olds are mature and so are twelve yearâ¦ olds.
Okay, to start, there is a huge difference between preteen and tween. Preteen: Someone between the ages of 9 and 13. Tween: A little girl, who thinks that she's an teenager because she's wearing a training bra, and she continues to act like a child.