While I don’t have access to real-time information or specific data on job placement percentages, I can provide you with some renowned institutes in Kolkata that offer data science and machine learning courses. These institutes are known for their quality education and job placement support. However, it’s essential to note that job placement outcomes may vary for each individual and can depend on factors such as skills, experience, and market conditions. Here are a few institutes in Kolkata to consider:

1. Indian Statistical Institute (ISI): ISI is a premier institute for statistics, mathematics, and computer science. It offers a Postgraduate Diploma in Business Analytics (PGDBA) program in collaboration with IIM Calcutta and IIT Kharagpur. The program provides rigorous training in data science and analytics, and ISI has a strong reputation for producing skilled professionals.

1. Jigsaw Academy: Jigsaw Academy is a well-known institute that offers comprehensive data science and machine learning courses. They provide both online and classroom training options. Jigsaw Academy collaborates with industry experts to design their courses and offers placement support to students.

1. Aegis School of Data Science: Aegis School of Data Science offers a full-time Post Graduate Program in Data Science, Business Analytics, and Big Data. The program covers various aspects of data science and machine learning and provides practical training with real-world projects. Aegis has a placement cell that assists students in job placements.

1. AnalytixLabs: AnalytixLabs is a reputed institute that provides training in data science, machine learning, and other analytics domains. They offer comprehensive programs with hands-on projects and case studies. While they do not explicitly mention 100% job assistance, they have tie-ups with several companies and provide placement support.

It is crucial to thoroughly research these institutes, review their course curriculum, faculty expertise, industry collaborations, alumni network, and placement records. Additionally, consider reaching out to current or past students for their experiences and insights. Remember that 100% job assistance cannot be guaranteed by any institute, but these institutes have a track record of providing support and guidance to their students in finding employment opportunities in the field of data science and machine learning.