How to say "What was your favourite subject" and "tell me something interesting about you"
Here are causal ways:

What was your favorite subject?

你上学的时候最喜欢什么课？

你上学的时候：time indicator
什么课：&quot;subject&quot; 科目 would be the same as &quot;course&quot; 课 for a student. &quot;课&quot; is more casual than &quot;科目&quot;


Tell me something interesting about you.

你有没有什么有意思的特点？说来听听。

有意思：causal version of 有趣
特点：characteristic of a person
说来听听：causal way to say &quot;tell me&quot;
This question is rarely asked by Chinese, as far as I know. We usually don't advertise ourselves by attaching interesting things and features to ourselves. Instead, we usually ask/talk about experiences, like &quot;tell me an interesting experience of you.&quot; 你有没有什么有趣的经历？说来听听。