I find it helps to write them down in a consistent way that is not a straight line. I write mine as 1 - 2 - 1 - 2 - target . where 2 means two numbers above each other and the big numbers are on the right.
Likewise the letters - certain letters are always written in the same place on my pad. Vowels go in the centre with U at the top, O/A in the left/centre, I on the right and E at the bottom. The other letters go around them with N & G going beside the I, uncommon letters at the top, common letters that can start or end words at the bottom (eg S T R L D) and letters that more often start words go on the left (eg C P M F). This makes it quicker to check if you can make words that come to mind.