Normally you cannot travel to the UK before the start date of your visa, as you must enter after the start date in order to 'activate' your Student visa status.
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Traveling Outside the U.S. While Your Application Is PendingU.S. Citizenship and Immigration Services (USCIS) considers leaving the country while your application is still under review as abandoning it, resulting in immediate denial. U.S. immigration can be complex and confusing.
You must have a passport or travel document to enter the UK. It should be valid for the whole of your stay. You must be able to show that: you'll leave the UK at the end of your visit.