I remember doing my theory ages ago, I did pretty good 35/35 and something like 53/75.
Your best getting them discs with mocks and buying the highway code seperate (it's like £1.49/99). The discs do a very good job at simulating the test questions. Remember all the memory things, like stopping distence, road signs, lights, speed limits, etc.
I found the hazard easier than I expected, keep your eye on the screen and watch ahead.
I found on the motorway ones, most of the time the hazard was someone joining the motorway and you had to move over or someone comes into your lane - apart from these two that's it for motorway I saw.
Also look at the road, usually you get one with a small narrow road which fits like 1 car in, if you do see one of these, chances are the hazard will be of someone either walking in the road or an oncoming car where you'd pull over.
Also at ped crossings look for people who 'look' like they 'might' cross (kids running) this is counted. Keep your eyes peeled, 'specially when going round a corner as you've no idea what to expect.
Also roads with parked cars, look for open bonnets/boots or people that might step out.
They've changed the questions to something like 50, recently but you should get more time. Also ONE hazard clip contains two hazards (I think it's still the same) so don't look away once you've spotted it.
I wish you good luck.