Succeeding in school can be as easy as you want it to be, or it can also be a challenge for you in the long run. What matters most is that you do know what needs to be done, how to get it done, and most importantly how to ensure that you can get some good results. Assignments are a way of life in school, so you cannot expect that you will not have to work on them.
However, in as much as you have to get used to homework from time to time in geology, you do not need to be worried about it all the time. In fact, all you need is some proper planning and you will definitely be in the best frame of mind to tackle your geology work the way you need to.