Don't know if you will be able transfer to another class unless under exceptional circumstances, which seems unlikely since the tutorial runs at the exact same time
(and the fact that it is already way past T1 Enrolment Deadline which was Mar 8). After this date you don't really have the option of making changes to your timetable so I don't really think you can much about it as of now. Just self-study 1151, going through the yellow book and doing the problems required. If you don't, discuss with peers etc. and use PASS classes if you really need to get that help (but even PASS can be a bit dodgy since some tutors already forgot some of the content). Also, the School of Maths has generously offered first-year consultation hours, so if you find the right person, that can help a lot as well
. Otherwise, since attendance doesn't actually count unless you fail the course, you could just rock up to the other class you wanted to go to and just go from there
. Besides who is your 1151 tutor?