Ans for Question
1. Well it all depends your skills & ability , but u might wanna give straight/to da point answers saves both your & examiners time. (it need not be descriptive if you have many points in the answer)
2.I
think you can , that helps the examiner & you , but however 4 some subjects they require paragraph & lengthy answers
, but i dont think it applys for computing , becoz they usually ask questions which require short answers.
3.Any thing as long as it helps examiner to clearly get or understand wat we hav written
(i'm not very sure of the things i mentioned , but however i'm going to write in point form for most of da answers)