After completing your VI semester, please find out what so far you have learned about the software development tools and website creation fundamentals. Then go through the syllabus of the VII semester and see what are the things that would be subsequently covered there. If sufficient coverage is there then you can learn these things by the end of VII semester. If it is not so as per the expectations then I am afraid you will have to go for some extra studies and may have to join some online class for full stack development learnings. Generally such courses are a bit costlier and come with a time schedule of 300 to 350 hours of learning.
Full stack development consists of learning many elements and if one is really interested in that then some hard work would be required to achieve this target. One has to study some additional elements which are outside the realm of the syllabus and that has to be seen thoroughly beforehand before joining any online activity in the matter.
Knowledge is power.