Hello,

If you know that you can do better in improvement exam then you may go ahead.You should also make sure that you have minimum percentage in 10+2 when you apply for any college.Because each college has it own eligibility criteria like few colleges only take candidates who have 70%  marks above in 10+2, few colleges may the minimum percentage requirement to be 60% marks or above.Once check with the colleges in which you are interested to take admission.