Hi, I'll tell you what I did,
while most of the people I knew were grade counting - I just focused on one thing. I am going to get the highest grade I can possibly get in all my modules.
this means that I need to put in the work for it and not do things last minute. Time is so valuable at university and no matter what - you gotta maximise it so you can produce your best work.
so to answer your question - Don't grade count or calculate what you need for a first, aim to get the highest possible grade in all modules and put in the work. check this audio post out on how to you can go about getting the grade you want
First Classhope this helps.