問問有關英文時態既問題

Present perfect (grammar) is the form of a verb which shows a period of time up to and including the present, and in English is usually formed with "have", and the past participle eg:-"found".
Error and corrections:-
I have prepared for my examination in ABC Study Room.

There were many tables in the Study Room.

The floor of the (big) Study Room was (found) uneven
=
An uneven level of the floor was found in the (big) Study Room.

Note:-A sequence of things is a number of them that comes one after another in the same Capital letters,eg:-Study Room.
----The word "exam" should be spelled complete:-"examination.
----Otherwise no problem lee.

Right Answer : I just prepared for my exam in ABC Study Room. It was big and there were many tables in the study room. The floor of the study room was uneven.