Everybody needs Maths! You need a grade C or above to get onto most further education courses. In addition to individual tuition all my students are registered for free to a subscription only Maths website (Mangahigh.com) which encourages them to do Maths between lessons and enables me to monitor their progress and respond accordingly.
I make weekly visits to a local secondary school who provide me with the latest textbooks and exam papers together with updates on new exam board requirements.
There is no minimum number of lessons and the first lesson is refunded if you decide not to continue. (I've never had to give one yet, but I am happy to risk you being the first! It's important the 'chemistry' between student and teacher is right.)
I give discounts for block bookings but do not charge for missed lessons providing I have at least 2 hours notice.