You should plan to take the Level 1 CFA exam this year in June/December.
If you were a good student and you have time to study 18-20 hours per week from now till the exam, then you should be able to prepare well and pass the exam in June/December.
You should sign up for the Level I Free package on the IFT website and start your studies.
If after 2-3 weeks you are getting along well, then you can register for the June/December exam with CFA Institute.
You should start with Quantitative methods.