You haven't mentioned if you are a Commerce Graduate or another stream Graduate. Because if you are a Commerce graduate with an aggregate of 55%, you can start with CA Intermediate, skipping CA Foundation. CA Intermediate has 8 papers divided over 2 Groups. You have to complete a minimum 9 month mandatory period of articleship before you appear for the CA Intermediate exams. The entire articleship is for 3 years. The 9 month period will be counted while calculating your articleship period.