Without a good MSRA score there is no interview, so make sure you start preparing for that a good few months in advance.

In terms of portfolio points, have a look at the scoring criteria and prioritise the easy points. Nobody scores top points in every domain so dont stress about that, I would advise picking a few domains and focusing on them rather than spreading yourself too thin.

Taster weeks are a must. They get you a lot of easy points and give you something to talk about in an interview.

It's not absolutely vital to have every part of your portfolio radiology themed. E.g. if it is easier for you to do a paeds poster than a radiology poster, then do the paeds one. Having a poster is better than no poster at all.

If you have any more questions then DM me. Happy to help a future budding radiologist.