Tool
Practice braille cells
Drill the alphabet until you recognise cells whole instead of counting dots. Answers are checked instantly and the run is scored.
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How to practise so it sticks
Do not drill the alphabet in order. Alphabetical order teaches you to recite, not to recognise, and the letters you actually confuse are not adjacent — d and f are mirror images, h and j are mirror images, m and u differ by which row carries the extra dot.
Drill contrasting pairs instead. The letter pages list each letter's one-dot neighbours for exactly this reason: those are the cells you will misread.
If you can see, cover the screen or read in the dark. Reading dots with your eyes while believing you are reading by touch is the standard trap for sighted learners.
More on this in how to read braille by touch.