hi mustbe! Nice to see someone else doing OCR B though it was not a fun paper at all!
They all had a lot of trouble with the last question (solar cell), the fusion one was very very odd, and the black hole, they were thrown by the graph being in radians (dd hadn't learnt Kepler's third law (which is not hard but she was convinced they didn't need to know)). So if it is any comfort to your ds most people thought it was horrid!
The grade boundaries for an A last year were 66/110 for that paper and 173/270 overall - so closer to 60% - I don't think this year's will be higher than that (& fx that they might go down). DD was predicted/hoped for an A but she'd be grateful for a B now tbh - it is very disappointing.
She's is expecting some nasty magnetism questions on Friday as they didn't come up yesterday - who really knows though!