• Firstly, we should be aware of some general requirements of the visa officer and have to take care that we don’t mess with the financial evidence which sounds major to be examined in the process.
• As per the UKVI guidelines, they reject the cases if they are not satisfied with the details you provided in your application in the context to get your study permit. Their main concern is applicants should show proper documentation which depicts the overall costing of their studies and living expenses and they are capable of bearing costs whilst living in the UK.
• If the officer is dissatisfied with the documentation or not able to find the application completed, he may overtake you for the embassy interview. Where they will try to find the incomplete information to know from you as a part of the interview (Generally video and audio), where you need to fill them in with appropriate details and prove that you are a genuine student. You may need to justify the purpose of studying in the UK, the destined course, and plans. Here you just can’t bluff on that or get any external help from any materials while ongoing interview, if they find so they will not be giving you another chance.
• You should not miss a single piece of paper in financial documentation as it could lead to the failure of your visa application. This is suggested on a higher note to make sure about the complete documentation along with sufficient fund details, here you should not miss any of the information asked as that can lead to failure under the incomplete application.
• The second major point could be your unclear intention to fly to the UK. Or filing in for the wrong visa type. i.e., if you are destined to go for a study you cannot select a tourist visa here on your application form. So, you should just take care of that while filling out the application. If you are not having any idea about this, you can take the help of immigration lawyers who are well experienced and knows to deal properly with it.
• You should never leave any information part blank or unanswered while doing the application, as it can also cause a rejection on the spot.
• If you have ever visited the country in past and violated any of its rules such as committed crime, involved in fraudulent activity, being a part of any terrorist activity, or overstayed and never returned to your home country even if their visa got expired and caught working while not having a permit, in such cases, your application can get direct refused by the visa officers. Here your visa can also get refused based on criminal records for the same.

These are some basic reasons why one can get refusal, you can visit Studyvisaplannet for further info.