Anacle Systems Mobile Applications Developer interview questions

Just finish my technical test at Anacle, basically the technical test on SQL + C#, but C# not much, mainly is on basic SQL. It is very similar to the quiz we did in school. there is 70% MCQ, 30% Open ended, one of the open ended question is write dk what recursive tree pesudo code in C#, that one I really dk sia. the second open ended question, will write SQL statement of count the number of product by the certain product ID, that one is doable. The last open ended question is write a method add(OpenVector a), to add the number inside 2 objects. the MCQ is very tricky, need to study the transaction of Database, which I never. Some of the SQL MCQ I dk how to do. The last mobile application MCQ is fairly easy, until I do the apple iSO part. I am not trained in iOS at all. the waiting time quite long, cos the HR people will suddenly disappear, and have to wait for her to come back to take my test paper. The interview they told me, will be after they mark my paper