This study was carried out to find out the effectiveness of Guidance services on pre-service teachers’ problem solving ability at Wesley College of Education in Ghana. A survey research design was used, and the simple random sampling technique was employed to select 200 students. Data collected was processed using STATA 15. Research questions and hypotheses were formulated to guide the study. Study habit was found as the most dominant problem encountered by the students. The results revealed a significant difference between pre-service teachers who had Guidance and Counselling and those who did not in their problem solving ability. The study also revealed that, there was no significant difference between male and female pre-service teachers who had Guidance and Counselling from those who did not in their problem solving ability. Recommendations were made and one of which was that, counsellors should focus on helping pre-service teachers develop good study habits.