Is it permissible to lie to a woman by accepting her conditions for marriage, with the intention of not fulfilling them, under the pretext that the suitor's circumstances do not allow for it?

The conditions set by the wife for her benefit, such as completing her studies, are valid and necessary conditions. Lying is forbidden except in specific cases, and there is no necessity in what you mentioned that permits lying and deception. Therefore, you must be truthful with the woman; if she agrees, then proceed, otherwise, look for someone else. There is no harm in agreeing to her condition with the intention of fulfilling it, then trying to persuade her to waive it by her consent after marriage.