I'm really sorry for the late reply. I don't mind the questions
None of my friends took their foundation in social sciences - my friends are interested in taking the foundation for biomed, engineering. Nevertheless, if you take the IIUM foundation, be it the pure sciences or social sciences, it is compulsory for you to learn arabic. Don't worry, you'll learn arabic up to band 2 (I forgot the total band.. Either 4/6). Your grades are fine, you can always contact the uni for confirmation
The Shariah law (LLBS) course, basically, you learn the laws that Allah set for us. You are required to memorise and learn hadiths, be familiar with Quranic verses.. So that you can settle matters such as divorce or the splitting of wealth/land in the court. The LLB is the normal law course, the one that deals with civil issues.
If you take the LLBS, you're doing a double degree. You will get both the LLB and the LLBS. There's an additional one academic year for shariah course. BUT, for the LLBS, you need to have at least Band 4 in arabic (Hence, the IIUM foundation). A test will be conducted to see your level in arabic - no worries, they'll prepare an extra arabic preparation class for you, should you need any.
If you want a shariah qualification, but you do not want to study LLBS, you can still take the diploma in shariah after you graduate your LLB.
For LLB, the classes will use English. You'll ace that course inshaAllah. Provided you study smart and hard for it yeah.
Anyway, Malaysia is pretty hot considering you live in the UK. It might take some time for you to adjust to the weather haha. Embrace the culture as well (or be shocked at it)- I'm sure some of the things here in Malaysia will be quite new to you. Just pray to Allah for guidance and approach the people if you need any help.