Application accommodation with supporting documents Interview COL (conditional offer letter). (it implies there are certain conditions you would like to meet to induce approval for assist stage) UOL (unrestricted offer letter; This arrange you would like to appear your upkeep finance with bank explanations and at long last pay your educational cost expenses to urge endorsement for assist step) CAS (affirmation of acknowledgment for studies). Once you make the installment and college compliance will do the ultimate survey to issue the CAS statement. Moreover, as an candidate, you wish to check your CAS (without any mistake) and all other pertinent records some time recently you apply for a visa.