user918273645 whilst it is true that you cannot tutor students though STEP, there are some things that can be done to support them. One of the major problems is a lack of confidence, these are students who have always found maths easy and then they suddenly are faced with Maths questions they cannot do. There is also a certain "Style" to STEP and familiarity with this is key.
The best way to prepare for STEP is to do questions, however it is a bit daunting to start with a full STEP paper in front of you. Stephen's book is excellent, but does not cover STEP III. Stephen was the driving force behind the "STEP correspondence course" which was the foundations for the STEP support programme.
The STEP support programme starts with 25 "Foundation" modules which aim to gently introduce STEP questions (from Christmas of year 12) and also cover some things which are taught towards the end of a single A-level (such as chain/product/quotient rule) so that the students are able to start working through papers earlier.
There are then "STEP II" and "STEP III" modules which have STEP questions, hints (so if you are stuck - after having had a good long try - you can get a hint rather than a full solution), solutions and "Topic notes", so that if something has not yet been covered in school, the student can still try the questions. We do recommend that students work through past papers in the last couple of months before the exams.
Another issue is that it can be a very lonely experience preparing for STEP if you are the only student at your school doing it. We have a forum on the website where students can ask questions and see others struggling with things
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Whilst there have been online courses for a while (run by MEI/FMSP and some companies), these are usually charged for, or some universities run courses but these are only for students applying to their university. We have put together a course which is completely free and available to everyone!
If you have any suggestions for how we can improve the website, please send me a message. Cheers!