Put your spellbook on a computer, ipad, or ipod. this way you can password protect it. then put all of your magic supplies in plain sight all around your room. this way your parents will think of them as decorations instead of magic supplies.
My mother doesn't trust me with candles, fire, really anything that can kill us all in a matter of minutes so, i hide them. on and under my wardrobe. In shoe boxes under my bed, hollowed out books, behing things, anywhere i can actually. SO if fear of confiscation of your items, not just afraid of your mother finding out. All the places are good.
I'm in around your age, and i know there are just things you just can't tell.
Well if it was me I would try to hide it in plain site.Now I know this sounds stupid but listen.If you have a book bigger than your magic book and you don't care for it cut out the inside and put the magic book on the inside.
If your mom's a big snoop I would hide it somewhere she won't be allowed to look, like a friends house. If have a friend that already knows your into witchcraft and is cool with it you can hide your books ad supplies at her house. It is an easy thing to do, especially if she lives right down the street.