Yeah youll be fine, i did it last summer, the physical side is pretty easy, the only thing i was bit rubbish at was the surface dives, but the pool i did it at had several depths so i was ok, it generaly is just short distance swims, the longest timed swim was swimming 20 metres, then having to tow a casutaly back 20 metres, think you had around 65 seconds to do that, which is more than enough, on the actual test day my times were so about 10 seconds faster than all my practise times i did during the week, must have been the adrenalin lol, must say i was pretty nervous beforehand though