關於English sentence 既詢問

您的句子有好大問題，希望這是你最後一次問這樣的問題。

Last Wednesday when his sister was sleeping, Tommy drove to Apple Study Room, where he prepared for his exam from 9:30 a.m. to 1:00 p.m. (period)


Note:
Don't write other things irrelevant to the main idea!
A study room with 25 desks is not big!
How could Tommy study if the study room was fully packed with 25 students?

2014-06-23 09:15:22 補充：
Useful notes regarding work and exams (Oxford dictionary):

study / prepare /
(British English) revise/
(North American English) review/
(North American English, informal) cram

for a test or an exam

She asked which marking scale you want to adopt.

The past continuous tense is used to express an action that was going on during time in the past,eg:-
As Tommy was revising the lessons, his sister was sleeping.
While he was finishing revision (gerund),the time was showing at 1 pm.
The simple past tense is used to express an action wholly completed at some point, or during some period, in the past, eg:-
Tommy went to Apple Study Room to prepare for his lesson last Wednesday.
He drove his car to the study room.
He arrived at the study room at 9:30 am.
He revised in the process of learning work for a Wednesday exam.
Note with minor changes,the past tense form in your case is not used to indicate time at all but rather suppositions implying non-fulfilment or desirability,which would be more correctly described as the past subjunctive mood which indicates that the subordinate clause (=in the process of learning work for a Wed.exam) does not express a fact, but only with your hope of could, might, would etc.
Learning how to "co-ordinate" between the principal and subordinate clauses is more important and rewarding in your sentence patterns.