For bangladesh, the follow are applicable for country tie:
1. Properties
2. Family
3. Affiliation
4. Sabatical
5. Previous work experience
6. Travel history
I showed 1, 2, 3, 5 and 6. In case of undergrad students, 1, 2 and 6 should be enough. And it wouldn't hurt to provide some further proofs (like reference letters from academic advisor/teacher). Btw, this one is strictly for BD only (and maybe for pakistan to some extend).