Dear Saadi Brother!
First of all I would like to apolojize for delayed reply, as I was quite busy in some matter.
Now, in response to your query about improving Arabic language, there are some tips that would help you alot.
Fundamental principles of learning any language are comprised on four steps;
1. Listening
2. Speaking
3. Reading
4. Writing.
Now for beggeiners, one should focus on the first two.
For this you can do the following:
a). Be regualar in your lectures so that you can keep in touch with Arabic and course content.
b). You should listen to the lectures given in Hostels or faculty by worthy Teachers, scholars specially in Arabic.
c). You can also get CDs or use Audio/Video Lab in CBS for improving yur Arabic Language, it would be very beneficial.
d). Also, Importantly (I don't know how many foreigners your have with you in class) keep in discussion with them and with foreign hostelites. [Obviously in Arabic :)]
Importantly Dear Saadi, learning a language is not a days' job, it take time, and with passion and dedication you can learn it.
How soon? Well it dfepends upon Allah SWT's Blessing and your hardwork.
Hope these will be useful for you.
Regards.