Q1: Please what can I do next?
Q2: What does it means for me in future and when I re-apply again?
Q3: Is it good idea to reapply back in 1 month time?
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To go to my university to get some document which will be of help in the future
Really? Is that the best you came up with in a visa application? I'm sorry to be blunt but you just wasted your hard earned money. That was never going to get approved that way.
Successful applicants spend a great deal of time or attention on applications to make a strong case. Those vague statements do not get visas.
Please consider reapplying only when there is a more convincing reason.
Even a non-visa national can not be so casual in a landing interview and expect leave to be granted, let alone a visa application.