You need to make your choices and get started as quickly as possible.

However, you should start with an overview of the paper.

Identify those questions you can answer or prefer to attempt.

Eliminate those which you can't answer or prefer to avoid.

When you have eliminated questions, you have less material to deal with.

Analyse the questions as you would do for course work - but do it quickly.

Some choices can be made [almost unconsciously] whilst you are writing.

Stick to those topics you have revised: don't try something new.

Leave room for making changes as you go along.