Website up and down for no reason at all

[astarmathsandphysics]

I have been working for over two years now to make www.astarmathsandphysics.com number 1 in google for London maths tutor. My website has pagerank 3 now and I am wring maths notes. It gets an seo score always between 95 and 100% and still it is not number 1. I am stumped.

[astarmathsandphysics]

Probably means nothing at all to most people but yesterday I did a tutor request page.
http://www.astarmathsandphysics.com/request_tuition.html

I had been wanting to do something like this for ages

And this morning I installed a custom search: Example

http://www.astarmathsandphysics.com/sphider-1.3.5/search.php?query=transistor&search=1