1) Pay the amount due on everyone of your account in full and on time everytime.
2) Limit your utilisation of credit – Do not use all your available credit to the maximum allowed, manage your debts responsibly and avoid applying for too much credit within a short time frame.
3) Maintain a healthy mix of credit – Store accounts, credit card, home loan, service contracts such as cellphone accounts and so on in order to establish a strong credit history.
4) Check on your credit report and your credit score regularly to make sure all your account payment are reflected and updated at all times.
Source: TransUnion credit bureau.