Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 784 397
2) Placement test : grammar for beginners (anonyme) 6 003 060
3) A/AN (webmaster) 5 371 940
4) Auxiliary BE (webmaster) 3 227 501
5) Present continuous (webmaster) 3 003 619
6) Present simple (webmaster) 2 926 866
7) Present simple (webmaster) 2 601 485
8) Present continuous (webmaster) 2 441 482
9) Adjectives (webmaster) 2 095 662
10) A/an (anonyme) 2 019 175
11) Present perfect simple (webmaster) 1 651 118
12) Preterite (webmaster) 1 637 763
13) Vocabulary - Placement test (bridg) 1 621 081
14) Preterite (webmaster) 1 453 352
15) Short placement test (webmaster) 1 445 233
16) To be (bridg) 1 408 368
17) Present perfect (webmaster) 1 352 541
18) What time is it? (webmaster) 1 351 421
19) The alphabet in English (webmaster) 1 323 045
20) Adjectives (anonyme) 1 217 959
21) What time is it? (webmaster) 1 212 042
22) Numbers (webmaster) 1 189 774
23) 'A' ou 'An' (anonyme) 1 178 313
24) Two presents: present continuous, present simple (webmaster) 1 151 926
25) To be (bridg) 1 147 283
26) Comparatives / Superlatives (webmaster) 1 111 050
27) Numbers (webmaster) 1 072 609
28) CAN / MUST (webmaster) 1 060 089
29) THE/ A / AN / nothing (webmaster) 1 036 852
30) Comparatives (webmaster) 1 008 589
31) Family life (bridg) 1 002 479
32) Numbers > 100 (webmaster) 987 725
33) Future (going to/will/present continuous) (anonyme) 966 916
34) Plural (webmaster) 957 309
35) Superlatives (webmaster) 876 646
36) Adjectives (anonyme) 876 239
37) Simple present (bridg) 855 734
38) Spelled words N°1 (bridg) 851 674
39) Placement test beginners: Check your spelling (anonyme) 830 945
40) Introducing oneself (webmaster) 828 166
41) Adverbs of frequency (anonyme) 819 814
42) Family (bridg) 786 108
43) General test-End of high school / Beginning of university (webmaster) 784 205
44) Present simple (anonyme) 784 185
45) Frequency adverbs (webmaster) 779 021
46) Present BE + Ving (bridg) 767 279
47) Passive form (anonyme) 732 538
48) Genitive (webmaster) 724 654
49) Family tree (anonyme) 720 545
50) Preterite: simple or continuous? (webmaster) 718 634
51) Placement test (beginners) (lili73) 702 925
52) Past simple or present perfect (anonyme) 697 946
53) Future (webmaster) 676 907
54) Present perfect simple (bridg) 665 264
55) 2 Preterites (webmaster) 664 126
56) Preterite (webmaster) 623 065
57) List of 200 irregular verbs and audio (bridg) 617 777
58) Modals (webmaster) 613 665
59) Spelled words N°2 (bridg) 610 351
60) Modals (webmaster) 608 676
61) Height (webmaster) 607 102
62) Articles a / an / the (anonyme) 596 783
63) Plural forms (bridg) 578 840
64) Nationalities (webmaster) 575 222
65) Past continuous / Past simple (anonyme) 570 150
66) Irregular plurals (bridg) 554 834
67) Two presents: simple and continuous (webmaster) 550 659
68) Preterite (bridg) 550 311
69) Superlatives (frapedur) 542 643
70) Vocabulary: greeting people (here4u) 536 598
71) Give your opinion (bridg) 533 057
72) Adverbs of Frequency (bridg) 517 924
73) Present simple or continuous (anonyme) 513 771
74) Present perfect / preterite ? (anonyme) 512 925
75) Possessive case (anonyme) 481 530
76) Countries & nationalities (bridg) 474 543
77) Past tenses (bridg) 472 431
78) 'The' or nothing? (webmaster) 471 959
79) Introducing oneself (easy) (webmaster) 471 393
80) Passive voice (webmaster) 465 186
81) Present Simple vs. Past Simple (anonyme) 460 803
82) Questions : how to ask them (anonyme) 449 278
83) General Test II / End of high school / Beginning of universi (webmaster) 446 924
84) IN, ON, AT or TO? (webmaster) 446 612
85) Relative pronouns (webmaster) 446 323
86) Comparative of superiority (anonyme) 440 846
87) How to pronounce the final -ED? (past simple) (webmaster) 439 764
88) Relative clauses (webmaster) 424 342
89) Sounds: [h] (webmaster) 420 077
90) Comparative (anonyme) 415 528
91) Past simple (anonyme) 401 082
92) A/an/Ø (bridg) 399 892
93) Future simple (anonyme) 397 899
94) This / That / These / Those (webmaster) 393 286
95) Conditional (webmaster) 392 878
96) Passive voice (anonyme) 391 966
97) Comparing (webmaster) 388 647
98) Can / could/ may/ might (woodyrun) 380 891
99) Present perfect or past tense (anonyme) 379 453
100) Much, many, little and few (felin) 374 990
101) Personal pronouns (anonyme) 371 751
102) Preterite continuous (BE + -ING) (webmaster) 371 274
103) Genitive case (bridg) 369 132
104) Some, any, no, enough, too/too much/too many (webmaster) 368 759
105) Confusing words - Placement test (bridg) 365 006
106) Irregular verbs (webmaster) 364 656
107) Numbers from 1 to 10 (anonyme) 362 110
108) Past perfect simple, past perfect continuous (anonyme) 361 278
109) Present continuous or present simple (webmaster) 360 173
110) Present perfect or preterite? (anonyme) 359 221
111) Simple Past : regular verbs (anonyme) 354 993
112) Comparative Adjectives (bridg) 352 800
113) Who, Whom, Which, or Whose? (anonyme) 349 931
114) Past simple (video) (anonyme) 349 610
115) Past simple or past continuous (anonyme) 345 831
116) While / When (anonyme) 341 045
117) What time is it? (webmaster) 338 741
118) Modals (tinou) 337 284
119) Modal: may/might (anonyme) 334 787
120) Cardinal and ordinal numbers (anonyme) 329 327
121) The superlative (anonyme) 327 853
122) Possessive adjectives and pronouns (woodyrun) 325 056
123) How to talk about the weather (lili73) 320 978
124) Since and for (anonyme) 319 808
125) Flags (webmaster) 318 141
126) Irregular verbs (bridg) 316 793
127) Pronouns (woodyrun) 315 540
128) Prepositions - in, on, at (anonyme) 314 605
129) Tenses (anonyme) 313 090
130) Placement test 3 (webmaster) 311 000
131) Order of adjectives (webmaster) 307 143
132) Could/Couldn't (laure95) 306 796
133) Comparative (anonyme) 305 385
134) Adjectives and prepositions (anonyme) 304 577
135) Agreement Tags (webmaster) 304 572
136) Asking questions (webmaster) 303 717
137) Present perfect OR simple past? (bridg) 298 895
138) Questions in the past tense (anonyme) 298 502
139) Uncountable nouns (webmaster) 296 571
140) Superlative Adjectives (bridg) 296 466
141) Object pronouns (bridg) 296 351
142) Passive form (anonyme) 294 186
143) Placement test 1 (anonyme) 293 428
144) Present simple (anonyme) 292 264
145) Can/Must/Should (laure95) 291 559
146) Past perfect (lili73) 290 806
147) Prefer/rather (bridg) 290 181
148) Must or Have to? (woodyrun) 288 630
149) The/an/nothing (bridg) 285 891
150) To be (anonyme) 283 664
151) Can and can't (laure95) 283 165
152) Vocabulary: asking and answering (here4u) 280 501
153) Modal verbs (bridg) 277 733
154) Some / Any / no... (bridg) 275 260
155) Days of the week (bridg) 269 224
156) So / neither (anonyme) 264 634
157) Past simple (video) (anonyme) 264 214
158) Present continuous (chnawa) 262 264
159) Used to (bridg) 260 602
160) Should / must (anonyme) 260 462
161) Past tense (anonyme) 259 807
162) Vocabulary: on the phone (here4u) 258 849
163) Find out a quantity (webmaster) 258 788
164) Articles : a / an / the / Ø (anonyme) 258 764
165) Superlative + and adjective (anonyme) 257 842
166) Comparative and superlative (anonyme) 257 413
167) Numbers 1/100 (anonyme) 253 994
168) Modal can (video) (anonyme) 253 455
169) Comparatives (anonyme) 251 466
170) Relatives pronouns (who, which, that...) (anonyme) 247 898
171) A few, a little, few, little (anonyme) 246 463
172) Vocabulary: at the restaurant (here4u) 245 714
173) Would rather / would prefer to (anonyme) 244 905
174) Present continuous and the Going to form (anonyme) 243 302
175) Should/ have to/ must (anonyme) 241 248
176) Have something done (anonyme) 240 164
177) Used to/would (woodyrun) 238 420
178) Future continuous and future perfect. (felin) 238 060
179) The past (webmaster) 238 059
180) How to ask a question in English (bridg) 236 232
181) Pluperfect (webmaster) 234 540
182) I wish, if only (felin) 234 425
183) Some / any (younes91) 234 243
184) Countable or Uncountable? (webmaster) 233 894
185) Should / shouldn't (anonyme) 232 138
186) Present simple or continuous (bridg) 230 839
187) Adjectives - ing and ed (felin) 229 623
188) Hypothesis (webmaster) 228 730
189) Must or mustn't (laure95) 227 021
190) Auxiliary BE (anonyme) 226 652
191) Articles a/an/the/0 (bridg) 226 482
192) Article The or nothing (anonyme) 226 344
193) Present perfect with Ever - never - (anonyme) 226 184
194) Present continuous OR Present simple? (bridg) 225 773
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 223 167
196) Comparison (komiks) 221 400
197) To / in order to / so as to / so that (irish21) 221 237
198) Present perfect (bridg) 219 851
199) Indirect speech (bridg) 218 031
200) What time is it ? (anonyme) 217 957
