Is it incumbent upon me to complete my university studies, or to marry first, or to combine work and marriage and try to complete my studies later; this being to protect myself from falling into sins?

If you fear falling into what is forbidden (haram), you must hasten to marry as long as you are able to, even if it conflicts with your studies, for marriage helps in preserving one's chastity. However, if you do not fear falling into what is forbidden, and your studies are essential, you may be patient with them, while frequently observing fasts and guarding your limbs.