If you are from one of the countries listed under the differential evidence requirement, you do not need to submit financial evidence or academic qualifications with your visa application. However, if the UKVI ask for these documents (outlined below), you must make sure you are able to provide them. If you cannot provide them, then your application will be refused.
To check if your country is listed under the differential evidence requirement, click on the following link and go to 'Eligibility requirements for a Student' and then to 'Differential evidence requirement for a Student'.