Re needing things written down because of the stress of playing in an exam situation, surely the stress of an exam is partly meant to help you learn how to play under stressful conditions, ie in front of a live audience!
If you want to learn to play jazz then presumably one day you'd like to be able to get up in front of an audience and play improvised jazz solos, therefore writing down anything more than a couple of guide notes at the very most would be very counter-productive.
As far as I'm concerned true improvisation doesn't even contain rehearsed licks and phrases but really does come straight out of the 'creative brain'. Learning the 'jazz scales' and relevant licks and phrases etc is just a means of learning the language and tools of jazz but the aim is to be able in a way to dispense with the tools and cast out on your own so you can play something spontaneously that is truly your own.
I went to a fantastic jazz concert the other night - the Norwegian Tord Gustavsen Trio. Gustavsen played something that was truly his own, using influences from his childhood - spirituals, Norwegian folk music, you name it, and wove it all together into a unique language. It's people like him who are taking jazz forward, and this is the way to approach jazz, as something that's always fresh and new, striving forwards.
So in a way, fear and clinging to the known shouldn't even be coming into it, even at the very early stages. After all, at Grade 1 level all you need to do is memorise a couple of scales and then let your imagination flow free! Some great jazzers even say practising jazz is counter-productive; what you need to practise is your instrument, so you can play any note and in any combination at any speed. The inspiration comes first and foremost from your brain.
In my jazz teaching these days I do a lof of getting students to sing solos; I find this really helps them develop their ideas. Then you have to get them to play on their instrument what they can hear in their heads - the hard part! But not if you really practise your instrument...
Oh and re a jazz examiner being able to discriminate between a rehearsed and a spontaneous solo, I'm sure this is one of the things they're trained to listen out for.
Any experienced jazzer will know the difference, and um, these guys are experienced jazzers I'm afraid!
QUOTE(rachyroo @ Jun 1 2007, 01:47 PM)

I have a student going for a jazz sax exam in the autumn - and I was wondering how do the examiners mark the improvisation section anyway?

I'd imagine they'd be listening out for the quality of the solos from the point of view of phrasing, rhythmic quality, swing, light and shade, range, choice of notes, variety, tension and release and sheer dynamism, adherence to the genre, confidence, communication and projection - to name just a few!