What sort of story-books WILL he read from choice? Adventure, sporting, fantasy and space, detective stories? There are many kinds of story books these days, so could there be anything that interests him?
When it's factual books, again what topics are his favourites? Science, space, animals, history or geography, engineering, computers?
What other activities does he do/enjoy?
Can he say WHY he doesn't enjoy reading? Are the books too easy for him, and what sort of reading level is he on? Can he WRITE stories, recounts, reports or book reviews?
Is his health, diet, sleep all OK? Does he have TOO MUCH 'screen time'?
If you consider all these queries (and answer them if you wish, but the important thing is that you think about them) perhaps it may give some clue on how to help him.
I will add below my Numeracy information, though it is really for younger children, so may not help much:
Practical things are best for grasping number concepts - bricks, Lego, beads, counters, money, shapes, weights, measuring, cooking.
Do adding, taking away, multiplication (repeated addition), division (sharing), using REAL OBJECTS as just 'numbers' can be too abstract for some children.
Number Bonds of Ten forms the basis of much maths, so try to learn them. Using Lego or something similar, use a LOT of bricks (of just TWO colours, if you have enough) lay them out so the pattern can be seen of one colour INCREASING while the other colour DECREASES. Lay them down, or build up like steps.
So:
ten of one colour none of other
nine of one colour one of other
eight of one colour two of other
seven of one colour three of other
etc,
then of course, the sides are equal at 5 and 5; after which the colours 'swap over' as to increasing/decreasing.
To learn TABLES, do them in groups that have a relationship, thus:
x2, x4, x8
x3, x6, x12
5 and 10 are easy
7 and 9 are rather harder.
Starting with TWO times TABLE, I always say: "Imagine the class is lining up in pairs; each child will have a partner, if there is an EVEN number in the class. If one child is left without a partner, then the number is ODD, because an odd one is left out."
Use Lego bricks again, lay them out in a column of 2 wide to learn 2x table. Go half way down the column, and move half the bricks up, so that now the column is 4 bricks wide. That gives the start of 4x table.
Then do similar things with 3x and 6x.
With 5x, try and count in 'fives', and notice the relationship with 'ten' - they will alternate, ending in 5 then 10.
It is important to try and UNDERSTAND the relationships between numbers, and not just learn them 'by rote'.
An inexpensive solar powered calculator (no battery to run out!) can help learn tables by 'repeated addition'. So: enter 2+2 and press = to give 4. KEEP PRESSING = and it should add on 2 each time, giving 2 times table.
There are good web sites, which can be fun to use :
www.ictgames.com/
www.resources.woodlands-junior.kent.sch.uk/maths/index.html