I burn a yellow candle and keep a yellow stone with me while I study and carry the stone when needed.

There is no such thing as coincidence!  There are lots of things you can do - you can crush gently and cover in boiling water leave for as long as you feel necesary ( you could try to focus clear focused energy transferring into to the water) Strain and add to bath water. sometimes I just add some sprigs straight to the bath - you sometimes end up with bits of flowers in your hair, but I don't mind this.  Having some near by when you are trying to learn something, shopping list, this months timetable, studying then carry some with you when you need to recall this.

Rosemary is great for losts of things it is very rotective and goes very well with Lavender in the bath or in a pouch/dream pillow under your pillow to aid a peacefull sleep and protect the dreaming you have.

Use it in your bath or in a sachet under your pillow, put a vase of it or hang some to dry by your desk. Excellent when used with lavender for baths and dream pillows.

Sorry I'm new here - I thought I sent a reply to this yesterday unless it has went as a private message - wich I didn't mean to.

You can usu Rosemary striaght into a bath or crush and steep in boiling water strain and add to bath.   You can have dried bunches hanging or in a vase around your home, or at a desk.  It goes particularly well with Lavender, which will only enhance clear headedness.  I also use both in a dream pillow with a pinch of mugwort and a blue lace agate and amethyst for procted blissfill sleep.  You can put a few drops of Rosemary oil on a hankerchief and carry in pocket for when you are out and about or pin a sprig to your lapel.  Rosemary is very protective as well as memory enhancing.

Hope this helps

You can make for you a Planetary Kamea!
The Planet which works with memory and mind is Mercury, so you can do a Kamea of this planet and use it.
Don't need a big ritual for it, only a consecration in a day and hour of Mercury.