The so-called financial guarantee actually refers to the ability to prove that you can afford the costs during your study abroad. The guarantor is preferably your own parents or yourself (if you have been working for many years). In theory, guarantees from relatives and friends abroad are also acceptable, but they are often not very credible and may even lead to suspicions of immigration tendencies. The best form of guarantee is bank fixed-term deposit. If there are multiple small deposits accumulated over the years, the credibility will be very high.