hello aspirant,

see you can give toefel exam any time. because almost every month toefel exam has slot. you need to just prepare yourself. and toefel exam has no link with gmat exam. you need to apply separately for toefel as it is a english language proficiency test. you can apply for visa after gmat exam. before applying do multiple checking of eligibility criteria and marks requirement, visa permit everything. it would be best if you take some professional help. please search in your city if there is any professional who help with visa application process.