The course grade is based 50% on the exam and 50% on homework assignments. In order to pass the course you must obtain at least 50% of the possible total points for the homework exercises.
If the maximum points among all students from a problem set or the final exam is below 100 then the points for all students from that PS/exam will be rescaled so that the rescaled maximum is 100. (This does not apply to the retake exam, due to fewer takers).
The total problem set points for the course takes into account your 4 highest problem set scores out of the total of 5 problem sets. This is meant to allow for one randomly missed deadline or sick days, etc.
There are no secret methods for obtaining extra credit or additional retakes or deadline extensions. The rules apply equally to everyone and contacting me or the course assistant directly does not lead to exceptions.
I aim to keep the grade distribution relatively stable across years, so I am not committed to any points cutoffs. However, unless it would result in an unusual grade distribution, I am likely to use the classic BIZ points cutoffs of 86-70-60-50-40.