Hiring a team of tutors to help you with the GMAT is itself a managerial challenge. You have a finite budget and time course, and want to maximize your score gains. Having experts to monitor progress is definitely helpful, but you also need it to be simple or it gets confusing.

There is no one-size fits-all right answer to this question. We'll address it for working with Test Prep Unlimited tutors.

We have multiple tiers of instructor, and most of our students work with tutors from more than one tier.

The higher your budget/higher your score target, the more you should work with upper level tutors. Starting off with lower levels and then switching later results in a weaker foundational base to build off of. For the same number of lessons, it's better to have the expert coverage from start to finish.

If your budget is under 3k and you're not trying to get past 650, you're best off doing it all with level I tutors. Most of our clients want more help than that, and therefore also (or entirely) work with our more experienced instructors.

Our intuition may or may not be helpful.

PS #102 in 2019 OG Supplement Quant is one example.

A gardener is buying bags of seeds in 5lb 10lb or 25lb bundles at $13.85, $20.43, or $32.25 each. We are asked to minimize the cost for a total between 65 to 80 lbs. Our intuition tells us that we should just aim for 65 lbs, but because of the way the costs work out, it turns out to be cheaper to by 75 lbs.

Similarly, just because one tier is less expensive than the next, that does not mean that you should work with that tier the whole time. Doing so may actually cost you more in the long-run than working with the more experienced instructors from the beginning.

There is no one-size fits-all right answer to this question. We'll address it for working with Test Prep Unlimited tutors.

We have multiple tiers of instructor, and most of our students work with tutors from more than one tier.

The higher your budget/higher your score target, the more you should work with upper level tutors. Starting off with lower levels and then switching later results in a weaker foundational base to build off of. For the same number of lessons, it's better to have the expert coverage from start to finish.

If your budget is under 3k and you're not trying to get past 650, you're best off doing it all with level I tutors. Most of our clients want more help than that, and therefore also (or entirely) work with our more experienced instructors.

Our intuition may or may not be helpful.

PS #102 in 2019 OG Supplement Quant is one example.

A gardener is buying bags of seeds in 5lb 10lb or 25lb bundles at $13.85, $20.43, or $32.25 each. We are asked to minimize the cost for a total between 65 to 80 lbs. Our intuition tells us that we should just aim for 65 lbs, but because of the way the costs work out, it turns out to be cheaper to by 75 lbs.

Similarly, just because one tier is less expensive than the next, that does not mean that you should work with that tier the whole time. Doing so may actually cost you more in the long-run than working with the more experienced instructors from the beginning.