Hi, your question doesn't provide proper details for me to give you a proper answer. All I can say is one, your semester exams may or may not be online but, there are chances that it will be offline. I'm saying this because I don't know from which board you are. Every exam is going to have equal difficulty level like before when exams happened offline. It really depends on how consistent you were while studying and also if you have understood the concepts clearly. If you wish to get more marks then make sure all your concepts are clear and for this time doesn't matter. Hope this helps. If you have any query please feel free to comment. All the best!