The ACTEX Study Manual for CAS Exam MAS-I (Modern Actuarial Statistics I) is available for purchase from ACTEX Learning or the Actuarial Bookstore.
Please do not hesitate to contact me (email: amblo201011@gmail.com) if there are any questions about the manual. I will try my best to get back to you ASAP.
Full solutions to the Spring 2019 CAS Exam MAS-I: [PDF]