Thank you, Olivia, and hello, everyone. Thank you for joining our call today. This fiscal year has been unusual and unprecedented in many ways, largely due to the COVID-19 pandemic. Despite the challenges we faced throughout the year, we have been proactively optimizing our operations and cost offerings to maintain competitive advantages in a tough market as we endeavor to prepare our business toward long-term sustainability.
In the fourth quarter of fiscal 2021, we are pleased to have concluded the year with a robust business recovery momentum, as market demand for our effective academically focused curricular and superior learning experience remains strong. We continue to outperform our revenue guidance and achieved a 26% year-over-year increase in total student enrollment during the quarter, underscoring our solid recovery trajectory.
Our heavy emphasis on curriculum design and the development distinguished us as a trusted partner of choice for students in their pursuit of our academic and intellectual excellence. In addition, our exceptional educational resources and well-versed tutors with strong academic background ensure that our adaptive curricula and effective educational programs resonate with students' needs, helping them meet their desired learning outcomes and academic goals throughout the unprecedented year.
We are also very excited to see a set of accelerated enrollment retention rates across our class offerings for the spring season in Shanghai-based learning centers, as they reach some of the highest levels in our record history. Heading into fiscal 2022, we are more confident than ever that we are on the right track to further improve our operations and return to our pre-pandemic growth trajectory.
Student enrollment in our middle school programs maintained its growth momentum with a 78% year-over-year increase in the fourth quarter. Further demonstrating our curriculum development capabilities to capture market dynamics in the fast-evolving after-school education landscape.
Our proven track record of delivering tangible learning outcomes enables us to generate a broader appeal for our well-aligned middle school course offerings and further cement our foothold in the after-school education market. In order to strengthen learning engagement and student loyalty, we continue to feature a wider spectrum of co-curricular and extracurricular programs, such as winter camps on writing, mathematical thinking, intangible culture, heritage, et cetera.
As part of efforts to expand our educational service portfolio, we have collaborated with community service providers to establish a community-based study room chain brand, the best learning space, which aims to deliver a wide range of educational programs, such as educational salons, study planning, self-study rooms, et cetera. We will also leverage the best to host various education-related events across online and offline venues to tap into a broader base of lifelong learners.
Additionally, we will cooperate with tech-focused Internet companies such as Tencent to explore the possibilities of delivery intelligent education to various consumers. Our learning space will support our endeavors to reach a wide student base and their daily and basic learning needs. Furthermore, our efforts to optimize our nationwide learning center network continued during the quarter as we add a new center outside Shanghai, a further testament to the growing organic demand for high-quality K-12 after-school tutoring services across the nation.
Going forward, we'll continue to enhance our stellar cost and service offerings in the K-12 after-school market to propel sustainable business development while simultaneously exploring new growth avenues. Also in the best-in-class educational programs and a strong tutoring team, we're confident in our ability to serve a broader user base in the pursuit of better learning experience while delivering long-term value to our shareholders.
With that, I will now turn the call over to our Vice President of Finance, Ms. Xun Wang, who will discuss our key financial results.