I did my graduation in MBA and my OPT is going to end soon. Can I join community college and study one semester and take a break and visit Nepal safely for this summer or december. As per my understanding of immigration as long as the student have valid I-20 and passport he can make visit. Has anyone passed through the  same situation ?

I found this in us immigration documents for F1 students.

I am a returning student. My visa is still valid but I am going to a different university/college now. Can I use the same visa?
If you have a valid I-20, a visa, and you have not fallen out of status, you can use the same visa to re-enter the United States even if you have changed your school. 

Has anyone after finishing the masters degree join the community college and came back to US safely. your suggestions are highly appreciated. Thanks in advance.