A very valid question. The truth is, there is no predetermined answer for knowing who your future partner is unless it is revealed by God to you. Now before I explain that, you are right and it is unfortunate that in today's day and age, believers tend to look at societal standing, financial background, education and assets to determine whether the alliance is suitable or not. These are valid concerns of course since you would not want to get married to someone who is 'not correct'. But in doing this, what has happened is that as children of God these have metamorphosised into unwanted criteria as well. Today believers do reject alliances because even though the boy/girl is God fearing and of good testimony in his/her community, he/she is not fit because they either don't have money, influence, property or any other materialistic aspect.
Now let me explain it briefly from my own personal experience. I do not want to take any hypothetical instances since that would cause a lot of confusion. Maybe this could guide you as you seek your partner.
When I did decide to get married - the first time, my prayers were for the one who would be my companion. My belief at that instance was that it would be answered in due time.
Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.
It was difficult to accept this since as much you are deeply rooted in this faith - the other person also needs to be touched by God to reciprocate. It took time, prayers and a lot of effort. Believe me, as much as I did not reject anyone, I faced a lot of rejection due to various and sometimes illogical reasons. I will admit I wavered a bit, felt bitter and a lot of negative thoughts did come. But God was merciful. He listened. He knew my prayer and provided at the right time. And that too without any of the fanfare or eligibility requirements of the community.
Why do I say pray? Because it is through prayers that you get the wisdom to discern, to choose, to make the right decision about your partner.
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him.
The last thing I would say is to leave it to Him - He will guide you. You just need to believe and have faith in Him. If He has chosen some for you, He will bring him to you at the opportune time. Just like Issac for Rebekah, Salmon for Rahab, Boaz for Ruth.
Be patient and not swayed by what people say. If you cast everything on Him. He will move you and you will find Him.
For ye have need of patience, that, after ye have done the will of God, ye might receive the promise.