Mr./Ms. NAME, I would like to inform you, that due to a driving class I am currently enrolled in, I will be unable to arrive to work on time every other day, for this current month. Thank You, YOUR NAME ---- I would perhaps tell the dates you will be arriving late. I would suggest asking permission first, and not just telling the boss you will be late.

Dear Mr [Manager's Surname], I'm sorry to inform you that due to my driving lessons being booked every other day of this month, I will unfortunately be coming to work later than expected. I will approximately be [30 mins, etc] late. I hope this is not a problem for you, and I hope we can work something out. Sincerely, [your name]