45% of 25% = 100(0.45*0.25) which is roughly 11%. You got the equivalent of 3.5% for the online test so you're on about 14.5%. So you have 70% of marks left available. Maximum of 84.5%, minimum of 14.5%, and to achieve a 'pass' of 30%, you need a little over 20% on the rest. If a pass is 40%, it's about 35% you need off the top of my head. Easily achievable.
If it helps, keep posting here with anything you struggle with - and I'll offer some advice to focus on pure economic loss in negligence (i.e. the Hedley Byrne v Heller branch of cases) - it's complex but if you know it well you can easily impress examiners. While you're doing that you may as well get tip-top on the rest of negligence, though you could probably skip out psychiatric injury etc.