Hi dear,
If you have done your +2 and interested in engineering you should appear in JEE main.after clearing JEE main you should apply for jee advance.With these exam you will get IITs NITs and Gftis.You can also appear in many state engineering exams and BITSAT for BITS PILANI and other campus of its.if you think that your preparation is not good enough you may drop one year and focus on these exams.
Hope it helps
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