Because No. is an abbreviation of the Latin word, Numero, meaning number.
You cannot abbreviate the number.
There is not a proper way to abbreviate the word 'consideration'. If you really do need to abbreviate the word, you could use the abbreviation of 'cons'.
You cannot abbreviate the number.
Tel. #
To abbreviate recoimmendation, you would use rec.
Use the abbreviation "INDV".
For example, instead of ++ you can use ++
Crse, crs, cre and C are four possibilities used to abbreviate course. I prefer to use Crse.
10K
The abbreviation of numéro is no.
You can use either ele. or elem.
I would use "sz."