请提前把资料发给我，以便我做好准备。

Qǐng tíqián bǎ zīliào fāgěi wǒ, yǐbiàn wǒ zuòhǎo zhǔnbèi.

Please send me the materials in advance so that I can get well prepared.

老师留下了自己的联系方式，以便学生有问题时能找到他。

Lǎoshī liúxià le zìjǐ de liánxì fāngshì, yǐbiàn xuéshēng yǒu wèntí shí néng zhǎodào tā.

The teacher left his contact information so that students can reach him when they have questions.