100 POINTS! COMPUTER SCIENCE IGCSE

I have a Computer Science assessment tomorrow, and the following skills are required :
- Understanding pseudo code
- Reading and interpreting pseudo code
- Asking questions about pseudo code
- Correcting pseudo code syntax
- Adding to existing pseudo code
- Programming techniques:
- Subroutines
- Selection statements
- Iteration

Please could anyone provide a brief overview, explanation + example for each of these?