You can choose the best materials engineering courses by assessing your academic goals. To complement this, factor in other aspects of your life such as time commitments, the difficulty of other courses you are taking, or how certain courses will impact you financially. Lay out some goals, and ask yourself if the courses you have selected fulfill them. If the answer is yes, you know you've done a good job. If the answer to this question is no, it may be time to consider different materials engineering courses.
If you are a full-time or even part-time student working toward a degree, you probably have limited flexibility with course selection. It is likely that there are required courses, and even those that you get to choose may be limited. Be sure that you select your materials engineering courses in accordance with those needed to obtain your degree. School is expensive and time-consuming, so wasting your money, time, and effort on unneeded courses can be an inefficient use of resources.
Perhaps you are not a student but rather taking these courses for personal enrichment or to learn a specific skill set. If the course is for personal enrichment, then you should follow your interests. Read the title, course description, and syllabus carefully in order to gain a perspective on what the course may offer. Remember that you may be spending your own time and money on this course, so you should be sure to enjoy the subject matter.
If you are taking materials engineering courses to learn specific skills, then your choice should be directed toward achieving this goal. After selecting your course or courses depending on your goals and needs, you can begin to consider other factors. One of these is the cost of each course.
As a full-time student, you probably qualify to take many courses at once for the same full-time tuition bill. This means that taking four courses and six courses will cost the same amount of money. If this is the case, you would be wise to fit as many materials engineering courses as you can into each semester. Be sure not to overwhelm yourself, though; it's a mistake many college students make due to inexperience.
You also need to be careful about the prerequisite requirements when picking out courses. Some advanced classes may require you to sufficiently pass intermediate or introductory versions before you can be enrolled. This means you can't just simply sign up for any class you want; you may have to prove yourself first.